Learn to write: Python for loop range function Xrange function

Script one:

#!/usr/bin/env python
# Coding:utf8
sum100 = 0

For I in range (101):
sum100 + = i
# (1) range is a function that can be valued, the top of which is 0-100 and does not contain 101

# (2) can also be specified, such as range (1,101) from 1 to 100

# (3) can also specify the step size, such as range (1,101,2) is to go from 1 to 100 end of the odd number

Print sum100

Script two:

Xrange uses the method of delay calculation, when you need to produce this number, the top is to use not all produced

Xrange (3)
>>> for I in Xrange (3):
... print I
...
0
1
2

Script three: output Fibonacci sequence

#!/usr/bin/env python

Fibs = [0, 1]

For I in range (8):
Fibs.append (Fibs[-1] + fibs[-2])//append Append-1 and-2 for the last two numbers

Print fibs

#!/usr/bin/env python

A, b = 0, 1

For I in range (10):
Print A,
A, B = B, a + B//python support Direct swap, no intermediate variables required

>>> [For I in Range (3)]//Put 30 in the list, put several times by range

[30, 30, 30]

>>> [i * * 2 for I in range (1,6)]//Put the results of the previous execution in the list, put several times by range to decide

[1, 4, 9, 16, 25]

>>> [i * * 2 for I in range (1,11) if I% 2]//will execute result put list, plus judgment, not 0 is true

[1, 9, 25, 49, 81]

This article is from the "Court of the Odd Tree" blog, please be sure to keep this source http://zhangdl.blog.51cto.com/11050780/1827617

Learn to write: Python for loop range function Xrange function