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divlogicdivlogic
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add the exercises I've done so far
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‎abcdCAllStack.py

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def a():
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print('a() starts')
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b()
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d()
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print('a() returns')
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def b():
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print('b() starts')
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c()
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print('b() returns')
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def c():
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print('c() starts')
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print('c() returns')
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def d():
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print('d() starts')
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print('d() returns')
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a()

‎allMyCats1.py

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print('Enter the name of cat 1:')
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catName1 = input()
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print('Enter the name of cat 2:')
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catName2 = input()
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print('Enter the name of cat 3:')
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catName3 = input()
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print('Enter the name of cat 4:')
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catName4 = input()
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print('Enter the name of cat 5:')
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catName5 = input()
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print('Enter the name of cat 6:')
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catName6 = input()
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print('The cat names are:')
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print(catName1 + ' ' + catName2 + ' ' + catName3 + ' ' + catName4 + ' ' +
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catName5 + ' ' + catName6)

‎allMyCats2.py

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catNames = []
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while True:
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print('Enter the name of a cat ' + str(len(catNames) + 1) + ' (Or enter nothing to stop.):')
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name = input()
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if name == '':
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break
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catNames = catNames + [name]
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print('The cat names are: ')
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for name in catNames:
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print(' ' + name)

‎birthday.py

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birthdays = {'Alice': 'Apr 1', 'Bob': 'Dec 12', 'Carol': 'Mar 4'}
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while True:
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print('Enter a name: (blank to quit)')
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name = input()
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if name == '':
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break
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if name in birthdays:
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print(birthdays[name] + ' is the birthday of ' + name)
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else:
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print('I do not have birthday information for ' + name)
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print('What is their birthday?')
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bday = input()
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birthdays[name] = bday
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print('Birthday database updated')

‎bulletPointAdder.py

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#! python3
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# bulletPointAdder.py - Adds Wikipedia bullet points to the start
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# of each line of text on the clipboard.
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import pyperclip
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text = pyperclip.paste()
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# Separate lines and add stars.
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lines = text.split('\n')
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for i in range(len(lines)): # loop through all indexes in the "lines" list
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lines[i] = '* ' + lines[i] # add star to each string in the "lines" list
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text = '\n'.join(lines)
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pyperclip.copy(text)

‎catnapping.py

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print('''Dear Alice,
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Eve's cat has been arrested for catnapping, cat burglary, and extortion.
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Sincerely,
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Bob''')

‎characterCount.py

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message = 'It was a bright cold day in April, and the clocks were striking thirteen.'
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count = {}
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for character in message:
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count.setdefault(character, 0)
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count[character] = count[character] + 1
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print(count)

‎chess.py

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goodBoard = {
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'1h': 'bking',
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'6c': 'wqueen',
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'2g': 'bbishop',
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'5h': 'bqueen',
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'3e': 'wking'}
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badBoardPrefix = {'1h': 'bking', '6c': 'wqueen',
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'2g': 'bbishop', '5h': 'queen', '3e': 'wking'}
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badBoardPiece = {'1h': 'bking', '6c': 'wqueen',
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'2g': 'bbishop', '5h': 'wace', '3e': 'wking'}
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badBoardPawnCount = {'1h': 'bking',
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'6c': 'wqueen',
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'2g': 'bbishop',
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'5h': 'wace',
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'3e': 'wking',
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'2a': 'wpawn',
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'2b': 'wpawn',
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'2c': 'wpawn',
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'2d': 'wpawn',
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'2e': 'wpawn',
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'2f': 'wpawn',
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'3g': 'wpawn',
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'2h': 'wpawn',
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'3h': 'wpawn'}
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badBoardGridNumber = {'1h': 'bking',
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'6c': 'wqueen',
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'2g': 'bbishop',
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'9h': 'wpawn',
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'3e': 'wking'}
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badBoardGridLetter = {'1h': 'bking',
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'6c': 'wqueen',
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'2g': 'bbishop',
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'3j': 'wpawn',
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'3e': 'wking'}
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badBoardKings = {
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'1h': 'bking',
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'2h': 'bking',
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'6c': 'wqueen',
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'2g': 'bbishop',
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'5h': 'bqueen',
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'3e': 'wking'}
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goodBoardStartingPositions = {
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'1a': 'wrook',
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'1b': 'wknight',
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'1c': 'wbishop',
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'1d': 'wqueen',
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'1e': 'wking',
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'1f': 'wbishop',
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'1g': 'wknight',
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'1h': 'wrook',
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'2a': 'wpawn',
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'2b': 'wpawn',
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'2c': 'wpawn',
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'2d': 'wpawn',
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'2e': 'wpawn',
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'2f': 'wpawn',
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'2g': 'wpawn',
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'2h': 'wpawn',
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'8a': 'brook',
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'8b': 'bknight',
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'8c': 'bbishop',
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'8d': 'bqueen',
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'8e': 'bking',
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'8f': 'bbishop',
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'8g': 'bknight',
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'8h': 'brook',
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'7a': 'bpawn',
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'7b': 'bpawn',
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'7c': 'bpawn',
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'7d': 'bpawn',
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'7e': 'bpawn',
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'7f': 'bpawn',
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'7g': 'bpawn',
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'7h': 'bpawn',
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}
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badBoardStartingPositionsExtra = {
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'1a': 'wrook',
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'3a': 'wrook',
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'1b': 'wknight',
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'1c': 'wbishop',
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'1d': 'wqueen',
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'1e': 'wking',
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'1f': 'wbishop',
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'1g': 'wknight',
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'1h': 'wrook',
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'2a': 'wpawn',
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'2b': 'wpawn',
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'2c': 'wpawn',
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'2d': 'wpawn',
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'2e': 'wpawn',
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'2f': 'wpawn',
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'2g': 'wpawn',
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'2h': 'wpawn',
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'8a': 'brook',
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'8b': 'bknight',
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'8c': 'bbishop',
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'8d': 'bqueen',
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'8e': 'bking',
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'8f': 'bbishop',
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'8g': 'bknight',
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'8h': 'brook',
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'7a': 'bpawn',
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'7b': 'bpawn',
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'7c': 'bpawn',
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'7d': 'bpawn',
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'7e': 'bpawn',
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'7f': 'bpawn',
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'7g': 'bpawn',
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'7h': 'bpawn',
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}
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def isValidChessBoard(board):
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isValid = True
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validNumbers = ['1', '2', '3', '4', '5', '6', '7', '8']
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validLetters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
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pieceCount = {}
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for coord, value in board.items():
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color = value[0]
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piece = value[1:]
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pieceCount.setdefault(color, {})
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pieceCount[color].setdefault(piece, 0)
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pieceCount[color][piece] = pieceCount[color][piece] + 1
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coordNumber = coord[0]
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coordLetter = coord[1]
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# all pieces must be on a valid space from 1a to 8h
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if coordNumber not in validNumbers:
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isValid = False
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if coordLetter not in validLetters:
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isValid = False
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validColorPrefix = ['b', 'w']
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validPieces = ['pawn', 'knight', 'bishop', 'rook', 'queen', 'king']
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totals = {}
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for key, pieces in pieceCount.items():
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# limit of 1 bking and 1 wking
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if pieces.get('king', 0) > 1:
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isValid = False
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# at most 8 pawns
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if pieces.get('pawn', 0) > 8:
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isValid = False
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# each piece name begins with a w or b, followed by 'pawn', 'knight', 'bishop', 'rook', 'queen', 'king'
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if key not in validColorPrefix:
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isValid = False
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for piece, count in pieces.items():
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if piece not in validPieces:
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isValid = False
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totals.setdefault(key, 0)
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totals[key] = totals[key] + count
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for total in totals.values():
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# at most 16 pieces per player
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if total > 16:
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isValid = False
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# must return boolean
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return isValid
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print(isValidChessBoard(goodBoard))
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print(isValidChessBoard(badBoardPrefix))
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print(isValidChessBoard(badBoardPiece))
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print(isValidChessBoard(badBoardGridNumber))
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print(isValidChessBoard(badBoardGridLetter))
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print(isValidChessBoard(badBoardKings))
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print(isValidChessBoard(badBoardPawnCount))
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print(isValidChessBoard(goodBoardStartingPositions))
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print(isValidChessBoard(badBoardStartingPositionsExtra))

‎coinFlipStreaks.py

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import random
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numberOfStreaks = 0
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def findStreak(flips):
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streaksCount = 0
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activeStreakLength = 0
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previousItem = None
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for index, currentItem in enumerate(flips):
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if currentItem == previousItem:
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activeStreakLength += 1
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else:
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activeStreakLength = 0
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if activeStreakLength == 5:
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streaksCount += 1
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previousItem = currentItem
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return streaksCount
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for experimentNumber in range(10000):
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flips = []
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for flipNumber in range(100):
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currentFlip = random.randint(0, 1)
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flips.append(currentFlip)
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activeExperimentStreaks = findStreak(flips)
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if activeExperimentStreaks > 0:
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numberOfStreaks += 1
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print('numberOfStreaks is: ' + str(numberOfStreaks))
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print('Chance of streak: %s%%' % (numberOfStreaks / 10000))

‎collatz.py

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import sys
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def collatz(number):
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if number % 2 == 0:
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answer = number // 2
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print(answer)
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return answer
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else:
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answer = 3 * number + 1
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print(answer)
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return answer
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try:
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while True:
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global number
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number = None
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print('Enter number:')
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while number == None:
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try:
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number = int(input())
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except ValueError:
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print('You must enter an integer.')
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while number != 1:
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number = collatz(number)
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except KeyboardInterrupt:
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sys.exit()

‎commaCode.py

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spam = ['apples', 'bananas', 'tofu', 'cats']
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def stringifier(listToStringify):
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newString = ''
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for index, element in enumerate(listToStringify):
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if index == len(listToStringify) - 1:
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newString += 'and '
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newString += element
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if index < len(listToStringify) - 1:
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newString += ', '
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return newString
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print(stringifier(spam))

‎commas.py

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import re
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commaRegex = re.compile(r'''(
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(^\d{1,3})# First group of numbers will be 1-3 digits long and at the start of the string
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(,\d{3})* # Any subsequent groups will be lead by a comma
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$ # the end of the string must come immediately after the full pattern.
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)''', re.VERBOSE)
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print(commaRegex.search('42').group())
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print(commaRegex.search('1,234').group())
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print(commaRegex.search('6,368,745').group())
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print(commaRegex.search('12,34,567') == None)
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print(commaRegex.search('1234') == None)

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