Python-based data types

List

Increase:

name = []name.append () Name.insert (index, Element) #元素

By deleting:

Name.pop (index), default lastname.remove (Element) del name[index]names.clear () #清空列表del names  Delete list

Change:

Name[index] = newvalue #新的值names. Extend (names2) #扩展names = names + names2 #扩展 #names2.reverse () #反转, Names2.sort () #排序, press as Order of CII Tables

Check:

Name.index (Element)  #返回index值name. Count (Element) Name[index] #返回对应的值name #返回整个列表

Collection

Linux = {"Alex", "SB", "AA"}python = {"Alex", "SB", "BB"}

Intersection:

Print (linux.intersection (python)) print (Linux & python)  

Subtraction

Print (linux.difference (python))  #差集, Linux has, Python does not have print (Python.difference (Linux)) #差集, Python has, Linux does not have print (Linux-python)

and set:

Print (linux.union (python)) print (Linux|python)

Inverse difference set, inverse and set:

Print (linux.symmetric_difference (python)) #对称, difference sets, printed on each other (linux ^ python) #对称, the difference between the print

Merge:

Linux.update (python)  #把Python合并到linux集合中

Increase:

Linux.add ("ALEX")

Delete:

Linux.discard ("Alex") #删除, the same as remove, but if the element does not exist will not error Linux.pop () # Randomly delete the Linux.remove (' Alex ') #删除, but if the element does not exist will be an error

Other:

Linux.difference_update (Python) is a subset of #求差集并赋值给Linux集合print (Linux.issubset (Python)) #, Linux has a few, and Python has print ( Linux.issuperset (Python) # superset, parent Set print (Linux.isdisjoint (python)) # If two subsets are not the same, then return True

String

name = "Alex eee Li" Print (Name.capitalize ()) #首字母大写print (Name.casefold ()) # Uppercase to lowercase if choice = = "Y" or choice = = "Y" Print (n Ame.center (()) #长度多少, not enough to fill-print (Name.count (' e ')) #统计字母出现的次数print (Name.count (' e ', 3,7) #统计3到7 There are several eprint ( Name.endswith ("Li")) # What's the end of name = "Alex\teee Li" Print (Name.expandtabs ()) #设置 \ t's length print (Name.find ("E")) print ( Name.find ("SDF", 3)) #返回找到的第一个值的索引, return-1 if not found

Formatted output

Print (' A1A '. Isalnum ()) #a-za-z 0-9print ("10.1". Isdecimal ()) #是不是一个正整数print (' AA '. Isalpha ()) #是不是字母print (' a '). Isidentifier ()) #identifier The keyword, is not a valid keyword, is not a valid variable name. Print (' A '. Islower ()) #是不是小写print (' a '. Isupper ()) #是不是大写print (' a '. isprintable ()) #是不是可打印print (". Isspace ()) # is not a blank print (' Today headline '. Istitle ()) #是不是英文标题li = [' Alex ', ' Jack ', ' Rain ']print (': '. Join (LI))   #把列表拼接成字符串print ( Name.ljust (+, '-')) #左对齐print (Name.rjust ()) #右对齐print (Name.lower ()) #大写变小写print (Name.lstrip ("Al")) # Remove left what print (Name.swapcase ()) #大小写互换name = "My name is {0}, I am {1} years old" in = "ABCDE" out= "[Email protected]#$%" trans_t able = Str.maketrans (in,out) print (Name.translate (trans_table))   #字符翻译print (name.replace (' name ', ' name ', 1)) # Replace print (Name.center (), '-') print (Name.count ("my")) name= "Luchuan Gao" Print (Name.casefold ())

Python-based data types