Python: Simplify statements

Abstract: Skills how to simplify loop and if statements

1. If statement

The common pattern of If statement:

>>> a

10

>>> if a==10:

... print 'a=', a

... else:

... print "hello"

...

a= 10

Here is a simple pattern:

>>> print 'a=', a if a==10 else "hello" #print

a= 10

>>> print 'a=', a if a==10 else "hello"

a= 10

>>> b=a if a==10 else 100 # assignment

>>> print b

10

>>> b=a if a<10 else 100

>>> print b

100

2. For statement

The common pattern:

>>> a=range(10)

>>> for i in a:

... if i%2==0:

... print i

0

2

4

6

8

This is a simpler pattern:

>>> a

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> even=[i for i in a if i%2 == 0]

>>> print even

[0, 2, 4, 6, 8]

writing date: 20150522