177177
178178## Logical Operator
179179* ` and ` and ` or ` are a logical operator.
180- * ` x ` and ` y ` returns ` False ` if ` x ` is ` False ` else it returns evaluation of ` y ` .
180+ * ` x and y ` returns ` False ` if ` x ` is ` False ` else it returns evaluation of ` y ` .
181181 If ` x ` is ` True ` , it returns ` True ` .
182182```
183183>>> 1 and 4
196196* ` x operator = expression ` is the syntax for shorthand operators.
197197```
198198>>> a = 15
199- >>> b += 30
199+ >>> b = 2
200+ >>> b += 30 # Same as b = b + 30
200201>>> b
20120232
202203```
@@ -241,9 +242,9 @@ ValueError: invalid literal for int() with base 10: 'hello'
241242'1.5'
242243```
243244
244- ## String Cancatanation
245+ ## String Concatenation
245246* Same type of string literals can be joined
246- * if the variable is not same type then convert it by using * + *
247+ * if the variable is not same type then convert it by using ` + `
247248```
248249>>> a = 'hello'
249250>>> b = 'COEP'
@@ -258,8 +259,8 @@ TypeError: cannot concatenate 'str' and 'int' objects
258259'hello10'
259260```
260261
261- ## Writting a program in file
262- * All programs are written with ` <filename> .py` .
262+ ## Writing a program in file
263+ * All Python programs are written with ` .py ` extension .
263264* Create a file named ` first_program.py ` and write the following code.
264265```
265266#!/usr/bin/env python3
@@ -275,7 +276,7 @@ $ chomd +x first_program.py
275276```
276277$./first_program.py
277278```
278- * On the first line you can ` #! ` , what we call it [ sha-bang] (https://en.wikipedia.org/wiki/Shebang_(Unix) .
279+ * On the first line you can ` #! ` , what we call it [ sha-bang] ( https://en.wikipedia.org/wiki/Shebang_\ (\) ) .
279280 The ` sha-bang ` indicates that the Python interpreter should run this code.
280281
281282## Decision Making using if, else
@@ -294,7 +295,7 @@ elif expression:
294295else:
295296 do something else
296297```
297- It works only when expression is true otherwise it goes to next line.
298+ It works only when expression is ` True ` otherwise it goes to next line.
298299```
299300>>> a = 100
300301>>> if a % 2 == 0:
@@ -307,8 +308,10 @@ Even Number
307308```
308309### Truth value testing
309310```
310- if a:
311- pass
311+ >>> a = True
312+ >>> if a:
313+ ... print("a is True")
314+ a is True
312315```
313316
314317## Functions
@@ -321,28 +324,28 @@ def function_name(function_arguments):
321324 do some stuff
322325 return something
323326```
324- * Here function_arguments are not necessary .
327+ * Here function_arguments are not mandatory .
325328* function arguments can be passed in any fashion
326- * If return is not define, it will not return anything ( None) .
329+ * If return is not define, it will ` None ` .
327330```
328331>>> def sum(a, b):
329332... print(a + b)
330333...
331334>>> sum(2,3)
3323355
333- >>> sum(a=2,b=3)
336+ >>> sum(a=2,b=3)
3343375
335- >>> x = sum(1, 2)
338+ >>> return_value = sum(1, 2)
3363393
337- >>> print(x )
340+ >>> print(return_value )
338341None
339342>>> def sum(a, b):
340343... return a + b
341344...
342- >>> x = sum(1, 2)
343- >>> x
345+ >>> result = sum(1, 2)
346+ >>> result
3443473
345- >>> print(x )
348+ >>> print(result )
3463493
347350```
348351
358361```
359362
360363### For loop
361- In Python loop works over a ` Iterator ` object.
364+ In Python loop works over a ` Iterator ` object,
362365might be a ` list ` , ` string ` , ` tuples ` , ` dictionary ` , ` set ` etc.
363366```
364367for i in sequence:
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