Merge pull request #7 from Code-by-practice/develop

Develop

Author: hegdeashwin

codes/ch1_syntax/eg1_helloworld.py

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+# Open terminal > python3
+# Start typing below commands and see the output
+
+a = [10, 20, 30, 40, 50]
+a # [10, 20, 30, 40, 50]
+a[0] # 10
+a[3] # 40
+a[-1] # 50
+a[0:3] # [10, 20, 30]
+a[3:5] # [40, 50]
+a[3:] # [40, 50]
+a[:2] # [10, 20]
+a[-2:] # [40, 50]
+a[:-2] # [10, 20, 30]
+
+a + [60, 70, 80, 90, 100]
+
+a[2] = 300 
+a # [10, 20, 300, 40, 50]
+
+a.append(250)
+a # [10, 20, 300, 40, 50, 250]
+
+letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
+letters
+
+# Replace some value in letters list
+letters[2:4] = ['C', 'D', 'E']
+letters # ['a', 'b', 'C', 'D', 'E', 'e', 'f', 'g']
+
+# Remove them
+letters[2:4] = []
+letters
+
+# Clear list
+letters[:] = []
+letters # []
+
+# Nested list
+a = [1, 2, 3]
+b = [4, 5, 6]
+x = [a, b]
+x # [[1, 2, 3], [4, 5, 6]]
+x[0] # [1, 2, 3]
+x[0][1] # 2
+
+
+
+
+
+

codes/ch1_syntax/eg2_comments.py

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+# Open terminal > python3
+# Start typing below commands and see the output
+
+2 + 2
+45 - 5
+
+# Division always returns a floating point number
+45 / 5
+
+# To avoid floating in division
+45 // 5
+
+17 % 2
+
+5 * 2
+
+5 ** 2 # 5 square, 5 to the power of 2
+
+width = 45
+height = 45
+width * height
+
+# List printed expression is assign to `_`
+a = 100
+b = 200
+c = 250
+
+a + b # 300
+c + _ # 550 (250 + 300)
+
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