Python full stack day10 (base data type)

One, the number

1,int converts a string into a number

A = ' 123 '

B=int (a)

B=123

2, convert in binary mode

Num= "a"

>>> num = "a"

>>> Int (num,base=16)

10

　　The default base of 10 does not need to be added

3,bit_length is currently the number of bits numbers

>>> age = 3
>>> Age.bit_length ()
2
>>> Age = 8
>>> Age.bit_length ()
4

PS: In Python3, no matter how many numbers are int type

Two, string

1,capitalize First Letter Capital

>>> test= "Zhangsan"
>>> test.capitalize ()
' Zhangsan '

2,casefold,lower the capitalization into lowercase casefold Many unknown correspondence also apply

>>> test= "Zhangsan"

>>> Test.casefold ()

' Zhangsan '

　3,center minimum number of characters, not enough characters to use spaces instead, or you can use other symbols instead of spaces

>>> Test.center (8)

' Zhangsan '
>>> Test.center (9)
' Zhangsan '
>>> Test.center (10)
' Zhangsan '
>>> Test.center (11)
' Zhangsan '

　　>>> Test.center (10, ' * ')

' *zhangsan* '

　4,count computes the number of occurrences of a subsequence in a string, and can be represented by a number representing the beginning of the search

　　>>> test.count (' Z ')

1

　5,endswith judge whether the end of the door startswith

>>> test.endswith (' a ')

False

>>> test.endswith (' N ')
True

6,find from the beginning, find the location number (starting at 0)

>>> test.find (' H ')

1

>>> test.find (' A ')

2

7,format string is formatted to replace the placeholder in the string with the specified value

>>> test = ' I am {name} '
>>> Test.format (name= ' Zhangsan ')
' I am zhangsan '

　　

>>> test = ' I am {0},age={1} '
>>> Test.format (' Zhangsan ', 19)
' I am zhangsan,age=19 '

8,format_map format in dictionary mode

>>> Test
' I am {name} '
>>> Test.format_map ({"Name": "Zhangshan"})
' I am Zhangshan '

9.index function similar to find if it is different from find if no direct error is found

10,isalnum determine if a string contains only letters and numbers

>>> ' ASD '. Isalnum ()
True
>>> ' asd_+ '. Isalnum ()
False

Three, List

Four, Yuan zu

Five, dictionary

VI, Boolean value

Python full stack day10 (base data type)