Python for loops and arrays

For-Target in expression:

Loop body

Example 1:

' songcuiting '  for inch a:print (i,end=',')

Example 2:

member = ['song','cui','ting' ] for in Member:print (Each,len (member))

Range Syntax:

Range ([Start,] end[,step=1])

[] Enclose the non-required parameters, the start parameter represents the start number (not fill the time 0 start), the step parameter represents the end number-1. Step indicates every few numbers. Default is 1

Example:

List (range (10))

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

List (range (0,5))

[0, 1, 2, 3, 4]

List (range (2,9))

[2, 3, 4, 5, 6, 7, 8]

List (range (1,10,2))

[1, 3, 5, 7, 9]

 for  in range:    if i%2 ! =0:        print (1  , i)        continue    2    print (2, I

Please answer the output of the For loop above

 for  in range:    2    Print (i)

Doubt: I will not be assigned a value of i + = 2.

The current explanation is that I was re-assigned to the range (10) at the time of the For loop, or that I was not affected by the range (ten) for loop.

member = [' song ', ' Cui ', ' ting ', ' Girl ']

Member1 = Member [1:3] # #创建member1 The end result of an array containing 1 to 3 (not containing 3) is member1=[' cui ', ' ting ']

Member [1:]

Member [: 3]

Member [:]

Ways to add elements to a list: Append, Extend, insert

Member.append (' haha ') #只能逐个在数组尾部添加元素

Member.extend (' haha ')

Member.extend ([' Nihao ', ' Xiexie ']) #可以再数组尾部添加元素及数组

Member.insert (1, ' haha ') #在数组的第二个位子上插入haha

Remove an element from the list: Remove (), Del, Pop ()

Member.remove (' haha ') # #删除列表中的haha

Del member [1] # #删除列表中的第一个元素

Del member # #删除列表

Name = Member.pop () # #删除最后一个元素 return value for this element. When the Python array is created, it is created as a stack, and the last entry is dropped first.

Python for loops and arrays