Python Workshop Lesson 3 added.

Author: Ebad8931

03_standard_types_lists.py

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+# creating lists
+numbered_list = [2, 4, 6, 8, 9, 0, 3, 5, 6]
+text_list = ['apple', 'oranges', 'mangoes', 'x', 'y', 'z']
+mixed_list = [45, 'This is the second element', 2019, [56, 34, 'xyz']]
+
+# Displaying Lengths
+print(len(numbered_list))
+print(len(text_list))
+print(len(mixed_list))
+print(len(mixed_list[3]))
+
+# Accessing Values
+print(numbered_list[4:6])
+print(text_list[:1])
+if 4 in numbered_list:
+    print(mixed_list[3][2])
+elif 8 in numbered_list:
+    print(mixed_list[1])
+else:
+    print(mixed_list[3])
+
+# Adding new elements into the list
+print(numbered_list)
+numbered_list = numbered_list + [33, 55, 10]
+print(numbered_list)
+numbered_list.append(89)
+print(numbered_list)
+numbered_list.insert(4, 46)
+print(numbered_list)
+
+# Deleting items from list
+del(numbered_list[4])
+print(numbered_list)
+del(numbered_list[9:])
+print(numbered_list)
+
+# Updating Lists
+numbered_list[4] = 7
+numbered_list[5:7] = [0, 2, 4, 5]
+print(numbered_list)
+
+# Doubling the elements in the list
+for num in numbered_list:
+    num = num * 2
+print(numbered_list)
+
+for i in range(len(numbered_list)):
+    numbered_list[i] = numbered_list[i] * 2
+print(numbered_list)
+
+# List Comprehensions
+squared_numbers = [n**2 for n in numbered_list]
+print(squared_numbers)
+
+
+

03_standard_types_strings.py

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+# creating a string
+text = 'N2E Python Programming'
+
+# Accessing a letter in a String
+print(text[0])
+print(text[5])
+print(text[-1])
+print(text[-4])
+
+# Accessing letters in a string
+print(text[1:5])
+print(text[:6])
+print(text[8:])
+
+# creating new text
+new_text = 'Hello world!'
+
+# Concatenation of stings
+print(text + ' & ' + new_text)
+
+# Updating Strings: Output Hello Python using text and new_text variables
+print(new_text[:6] + text[4:10])
+# Replacing Python with Java
+# text[4:10] = 'Java' results in an error 'str' object does not support item assignment
+print(text.replace('Python', 'Java'))
+
+# Count the number of letters (spaces included) in the string
+print(len(text))
+# Change Case
+print(text.upper())
+print(text.lower())
+
+# Checking Presence
+print('Py' in text)
+print('P' in text)
+print('w' in text)
+print('t' not in text)
+print(not 'x' in text)      # warning
+print(text.startswith('N2'))
+print(text.endswith('g'))
+
+# String formatting
+print('You are enrolled in {year} year in {major} Major. You have '
+      'currently taken {no_of_credits} credits and your '
+      'GPA is {gpa}'.format(year='Sophomore',
+                            major='Computer Engineering',
+                            no_of_credits=15, gpa=3.58))
+