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Python learns list notes

List (list) is the most frequently used data type in Python

Support for characters, numbers, strings and even lists (so-called nesting)

1. Definition:

List = [1, 3, 4, 5, 7, 4, 5, 7, 4, 4, 5, 4, 5, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 5, 5, 4, 4, 4, 4, 4, 5, 4, 4, 5, 5, 4, 4, 4, 4, 5, 4, 4, 5, 5, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4

2. Increase from the last column:

List.append ("your are good!")

Display:

Direct input: list

Display: [1,3,4,5, 'goog',' well', 777, 'your are goodwill']

3. Add a column from the middle such as:

Use: insert function:

The method of use is as follows:

> list.insert.

> list

[1,3,4,5, 'goog',' liwen', 'well',' liwen', 'liwen', 777,' your are goodwill']

4. Delete one:

Use del

Such as:

> list

[1,3,4,5, 'goog',' liwen', 'well',' liwen', 'liwen', 777,' your are goodwill']

> del list [1] # Delete the first subscript value

> list

[1,4,5, 'goog',' liwen', 'well',' liwen', 'liwen', 777,' your are goodwill']

5. Traverse all values:

List = [1,4,5, 'goog',' liwen', 'well',' liwen', 'liwen', 777,' your are goodwill']

Use the for loop to iterate through:

For i in list:

Print i

6. Use the len function to view the list length

List = [1,4,5, 'goog',' liwen', 'well',' liwen', 'liwen', 777,' your are goodwill']

Print len (list)

Print'='

A = 'ddddddddddddddddddd'

Print len (a)

ten

=

nineteen

=

7. Calculation: statistics 5 appeared several times:

C = [1, 3, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 6, 9]

Ncount = 0

For i in c:

If I = = 5:

Ncount = ncount + 1

Print ncount

Results:

six

= ncount=

Even and odd numbers:

Range (1, 101, 2) Odd

[1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23,25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63,65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99]

Range (2, 101, 2) even numbers

[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26,28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66,68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100]

Add:

1 、

#! / usr/bin/env python

#-*-coding: utf-8-*-

If _ _ name__ = ='_ _ main__':

List = ['html',' js', 'css',' python']

# method 1

Print u 'traversal list method 1VR'

For i in list:

Print (u "serial number:% s value:% s"% (list.index (I) + 1, I))

Print u'\ ntraversal list method 2vl'

# method 2

For i in range (len (list)):

Print (u "serial number:% s value:% s"% (I + 1, list [I]))

# method 3

Print u'\ ntraversal list method 3VR'

For I, val in enumerate (list):

Print (u "serial number:% s value:% s"% (I + 1, val))

# method 3

Print u'\ nTraverse list method 3 (sets the initial position of the traversal start, only changes the starting sequence number):'

For I, val in enumerate (list, 2):

Print (u "serial number:% s value:% s"% (I + 1, val))

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