Python Learning Comprehension Section 3rd

After the study of the list, the meta-group was studied. Tuples and lists function similarly, but tuples cannot be modified, so tuples are called read-only lists.

The following is a list of string operations:

Name.capitalize () #首字母大写

Name.count ("a") #数列表中有几个a

Name.center (5o, "-") #意思是一共打印50个字符, not enough to "-" fill

Name.endwith ("ex") #看字符串是否以ex结尾

Name.expandtabs (tabsize=30) #将tab键转换成30个空格

The following is a dictionary:

In dictionaries that are not indexed by location, the dictionary is unordered because it has no subscript and the dictionary does not need subscript because it has a key

info={

' stu1101 ' = "A"

' stu1102 ' = "B"

' stu1103 ' = "C"

}

Print (info)

(1) Check

Act 1): Print (info["stu1101"]) #通过键查找

Act 2): Print (Info.get (' stu1103 '))

(2) Change

info["stu1101"]= "WU"

(3) Increase

info["stu1104"]= "C"

(4) by deleting

1) FA 1:del info["stu1101"]

2) FA 2:info.pop ("stu1101")

#判断一个字典中有没有

Print (' stu1104 ' in info)

#多级字典的嵌套

catalog={

" "={

"Key": [List]

}

‘

" "={

}

}

Info.value () #打印值

Info.key () #打印键

Python Learning Comprehension Section 3rd