Python string, List function

First, the string function

1, Capitaliza first letter capital
# name = ' Alex '
# v = name.capitalize ()
# Print (v)
#
2, all caps are lowercase, casefold can be transferred to many languages, lower can only be transferred to English.
# name = ' AleX '
# v = name.casefold ()
# Print (v)
# name = ' AleX '
# v = name.lower ()
# Print (v)
#
3, center string Center, Parameter 1 (required) is the total length, parameter 2 (optional), default blank, fill character (only one)
# name = ' Alex '
# v = name.center (20, ' 2 ')
# Print (v)
#
4. The number of occurrences of the passed in string
# name = ' Alexal '
# v = name.count (' a ')
# Print (v)
#
5. Convert to bytes
# name = ' Zhang Yi '
# v = name.encode (encoding= ' utf-8 ')
# Print (v)
#
#
#
6. Whether to end with incoming value
# name = ' Alex '
# v = name.endswith (' x ')
# Print (v)
#
7. Whether to start with the incoming value
# name = ' Alex '
# v = name.startswith (' a ')
# Print (v)
#
8. Replace tab and newline character \ n (contains front character), incoming value is replacement length, display table format
# name = "ALEX\TERIC\TMERRY\NA\TB\TC"
# v = name.expandtabs (20)
# print (v)
#
9. Find the index position of the passed-in value in the string, there is no return-1
# name = ' Alex '
# v = name.find (' a ')
# Print (v)
#
10. String formatting
# # corresponding to the index location
# info = "I am: {0}; Age: {1}; Gender: {2}"
# v = Info.format ("Zhang Yi", 22, ' female ')
# print (v)
# # corresponding to the name
# info = "I am: {name}; Age: {Ages}; Gender: {Gender}"
# v = Info.format (name= "Zhang Yi", age=22,gender= ' female ')
# Print (v)
#
11, string formatting, according to the dictionary corresponding
# info = "I am: {name}; Age: {Ages}; Gender: {Gender}"
# v = info.format_map ({' name ': "Zhang Yi", ' age ': $, ' gender ': ' Female '})
# Print (v)
#
12. Find the index position of the passed-in value in the string, there will be an error
# name = ' Alex '
# v = name.index (' a ')
# Print (v)
#
13, whether it is a number, Chinese characters, true false
# name = ' Merry1 Zhang Yi '
# v = name.isalnum () #true words, numbers, Chinese characters
# v2 = Name.isalpha () #false Word, Kanji
# Print (v2)
#
#
14. Judging whether it is a number,
# num = ' ② '
# v1 = num.isdecimal () # ' 123 '
# v2 = num.isdigit () # ' 123 ', ' ② '
# v3 = num.isnumeric () # ' 123 ', ' two ', ' ② '
# Print (V1,V2,V3)
#
15. Whether a string in a variable conforms to a rule (contains numbers, letters, underscores, and cannot start with a number, but cannot judge a keyword)
# name = ' Alex '
# v = name.isidentifier ()
# Print (v)
#
16. Are all lowercase
# name = ' Alex '
# v = name.islower ()
# Print (v)
#
17, whether all uppercase
# name = ' ALEX '
# v = name.isupper ()
# Print (v)
#
18. Contains the implied \ t \ n, etc.
# NAME = "It's a nice day today, \ t let's go play together!" "
# v = name.isprintable ()
# Print (v)
#
19, whether all the space
# name = ' '
# v = name.isspace ()
# Print (v)
#
20, whether is the title format, each English word first letter is capitalized
# t1 = ' Can you Say Again? '
# v = t1.istitle ()
# Print (v)
#
21. Element concatenation (element String) * * * * * * ()
# name = ' Alex '
# v = "_". Join (name) # inner Loop each element
# Print (v)
# name_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ']
# v = "porridge". Join (Name_list)
# print (v)
#

Second, list function

1. Append
# user_list.append (' Zhu Yi ')
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# Print (user_list)
#
2. Clear
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# user_list.clear ()
# Print (user_list)
#
3. Copy
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# v = user_list.copy ()
# Print (user_list)
# Print (v)
#
4. Counting
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# v = user_list.count (' Zhang Yi ')
# Print (v)
#
5. Extensions (Append list)
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# user_list.extend ([' Zhu Yi ', ' Chu er ')
# Print (user_list)
#
6. Index (look for index position by value, from left to right, show only first one)
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# v = user_list.index (' Zhang Yi ')
# Print (v)
#
7. Insert (parameter one is the position index, parameter two is the insertion value)
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# user_list.insert (0, ' Zhu Yi ')
# Print (user_list)
#
8. Delete (by index)
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# user_list.pop (0)
# Print (user_list)
#
9. Delete (delete by value, delete only first from left)
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# user_list.remove (' Zhang Yi ')
# Print (user_list)
#
10. Flip
# user_list = [' Zhang Yi ', ' Zhang Yi ', ' Zhang Yi ', ' Zhang San ', ' Zhang Si ', ' Zhang Five ', ' Zhang Six ']
# User_list.reverse ()
# Print (user_list)
#
11. Sorting
# user_list = [' 1 ', ' 3 ', ' 8 ', ' 5 ']
# User_list.sort ()
# Print (user_list)

This article is from the "ermei22" blog, make sure to keep this source http://ermei22.blog.51cto.com/9186534/1925243

Python string, List function