Python Basics dictionary, Ganso, Common string method, file read and write

Dictionary: Key-value pairs exist. Key value

stu={
    ' Name ': ' Zhangsan ',
    ' Gender ': ' femanl ',
    ' Age ': 17
}
Print (STU)

#增加字典值

stu["Score"]=87
Stu.setdefault (' dictinct ', ' Nanshan ') #已经存在就不添加  sstu.update (xx)  #把一个字典加入到另外一个字典里面

#删字典值

Stu.pop (' age ')
Del stu[' score ']

Stu.clear () #清空字典

#查字典值

Print (STU)
Print (Stu.get (' Age ', ' 12 '))

Ganso

Cities = (' Beijing ', ' Shanghai ')  #一旦定义好, no more changes.
Print (Cities[0])
#修改元祖至不能通过常规的方式 to create a new
#删除元祖, could not have been subscript the way to Del Delete the whole
Del aities

Common string methods: (Built-in functions)

 # Print (Name.count (' t ')) #查询次数 
 # Print (Name.endswith ('. jpg ')) #判断字符串是否以xx结尾 
 # Print (Name.startswith (' 138 ') #判断字符串是否以xx开头 
 # Print (Name.upper ()) #都给你变成大写的 
 # Print (Name.lower ()) #都变成小写的 
 # Print (Name.find (' P ')) # When it cannot find the element, it will return 1 
 # print (Name.isdigit ()) #判断是否为纯数字 
 # Print (Name.isspace ()) #判断是否全都是空格 
 # Print ( Name.strip ()) #去掉字符串两边的东西, by default is the 
 # print (Name.lstrip ()) #只去掉左边的 
 # Print (Name.rstrip ()) of the whitespace and newline characters to be adjusted #只去掉右边的 
 # Print (Name.replace (' abc ', ' Look ')) #替换字符串, replace the front with the following 
 # name = ' 5 ' 
 # print (Name.zfill (2)) #在前面补0 
 names = "Lxy, ZYF,WDZ,NL,WY,GFW ' 
 # Print (Names.split (', ')) #1, split the string, 2, turn the string into a list 3, the default is separated by a space and newline characters 
 Stus = [' Lxy ', ' zyf ', ' Wdz ', ' nl ', ' WY ', ' GFW '] 
 ' Lxy, zyf, Wdz ' 
 print ('; '). Join (Stus)) #1, yes. List becomes 2 of a string, concatenated with a string 

Import string
Print (string.ascii_letters)  #所有的大写 + lowercase Letters
Print (string.ascii_lowercase) #所有的小写字母
Print (string.ascii_uppercase) # All uppercase letters
Print (string.digits) #所有的数字
Print (string.punctuation) #所有的特殊字符

# Print (Name.format ())
# Print (Name.format_map ())
# print (name[1]) #字符串也是可以根据下标来取值的

File Read and write:

Open files can be used with the open () function in Python

Ss

Python Basics dictionary, Ganso, Common string method, file read and write