Basic python codes and use cases

1.basicProgramming/0.interpreterCommands

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+$python
+    -- invokes the interpreter
+>>>quit()
+    -- exits from the interpreter
+>>> help
+    -- gets help
+
+# at the start of the line denotes single line comment
+# arithmatic operations
+>>> 2 + 2
+4
+>>> 50 - 5*6
+20
+>>> (50 - 5*6) / 4
+5.0
+>>> 8 / 5  # division always returns a floating point number
+1.6
+>>> 17 // 3  # floor division discards the fractional part
+5
+>>> 17 % 3  # the % operator returns the remainder of the division
+2
+>>> 5 * 3 + 2  # result * divisor + remainder
+17
+>>> 5 ** 2  # 5 squared
+25
+
+# simple variable declaration
+>>> width = 20
+>>> height = 5 * 9
+>>> width * height
+900
+
+# accessing the result of last operation with "_"
+>>> tax = 12.5 / 100
+>>> price = 100.50
+>>> price * tax
+12.5625
+>>> price + _
+113.0625
+>>> round(_, 2)
+113.06
+
+# simple printing
+>>> print("simple printing")
+simple printing
+
+

1.basicProgramming/1.helloworld.py

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+import sys
+
+def main():
+    print("hello world\n")
+    sys.exit(0)
+
+main()

1.basicProgramming/2.conditionalStatement.py

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+"""
+if else :
+
+nested if else:
+"""
+
+a = 10
+
+if a==10:
+    print(" a is 10")
+else:
+    print ("i dont know")
+
+
+if (a > 5):
+    print ("The number is greater than 5")
+    if (a > 7):
+        print("The number is greater than 7")
+    if (a > 9):
+        print ("The number is greater than 9")
+    if (a > 11):
+        print ("number is greater than 11")
+else :
+    print ("I dont know")

1.basicProgramming/3.forLoop.py

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+'''
+range (start_point , end_point , steps)
+
+for <iterator name> in <the thing through which it is to be iterated> :
+
+
+'''
+
+for i in range (1,10):
+    print (i)
+
+for j in range(1,10,2):
+    print (i)
+
+for k in range(10 ,1 ,-1):
+    print (i)
+
+sentence = "some_random_string"
+for i in sentence :
+    print (i)