Python formatted format and binary conversion

Format ()

Positional parameter {}

>>> "{0} love {1}.com". Format ("I", "cat")

' I Love cat.com '

Keyword parameters

>>> ' {I} love {cat}.com '. Format (i= "You", cat= "Me")

' You love me.com '

Combining positional and keyword parameters, the positional parameter must precede the keyword argument

>>> ' {0} love {cat}.com '. Format ("You", cat= "Me")

' You love me.com '

%c formatted character and its Ascⅱ code

%s formatted string

%d formatted integer

%o formatting unsigned octal numbers

%x Formatting unsigned hexadecimal

%x formatting unsigned hexadecimal (uppercase)

%f Formatted fixed-point number to specify the precision after the decimal point

%e to format fixed-point numbers with scientific notation

%E function with%E

%g depends on the size of the value to use%f or%e

%G function with%G

Cases

'%d +%d =%d '% (4,3,7+8)

→4 + 3 = 15

Auxiliary operator directives

M.N m is the smallest total width displayed, and n is the number of digits after the decimal point

-For left alignment

+ Show plus sign (+) in front of positive number

# 0 (' 0o ') is displayed in front of octal number, ' 0x ' or ' 0X ' before hexadecimal number

0 display number preceded by ' 0 ' to replace space

>>> '%5.1f '% 27.658 total width 5, 1 digits after decimal point

→ ' 27.6 '

>>> '%10d '% 5

→ ' 5 '

>>> '%-10d '% 5

' 5 '

>>> '%+d '% 5

' +5

>>> '% #o '% 10

' 0o12 '

Decimal Turn binary

Remainder

2/150

2/75 0 150/2 Business is 75, more than 0

2/37 1 75/2 Business is 37, more than 1

2/18 1 37/2 Business is 18, more than 1

2/9 0 18/2 Business is 9, more than 0

2/4 1 9/2 Quotient is 4. More than 1

2/2 0 4/2 Business is 2, more than 0

1/2 0 2/2 Business is 1, more than 1

0 1 2/2 Business is 1, more than 1

A binary number of 150 is 10010110.

Binary goto Decimal

1 0 0 1 0 1 1 0

1*2**7 0*2**6 0*2**5 1*2**4 0*2**3 1*2**2 1*2**1 0*2**0

150

Binary turn octal

Binary octal

000 0

001 1

010 2

011 3

100 4

101 5

110 6

111 7

010100.011101

Conversion from right to left, less than 0. Each three-bit represents a eight-bit

24.35

8 and 9 are not in the octal system

Hexadecimal

0~9 a~f

hexadecimal and binary correspondence relationship

0 1 2) 3 4

0000 0001 0010) 0011 0100

5 6 7) 8 9

0101 0110 0111) 1000 1001

A B C D E F

1010 1011 1100 1101 1110 1111

Binary to hexadecimal method: take four in unity

From left to right, 0 when insufficient

Hex Turn Binary

/2, 0 when insufficient

Decimal to octal and hexadecimal

/8

/16

Remainder

8/150

8/18 6

8/2 2

8 2

226

16/150

16/9 6

0 9

96

octal decimal and hexadecimal

150 = 226 = 2*8**2 + 2*8**1 + 6*8**0

Hexadecimal goto Decimal

150 = 96 = 9*16**1 + 6*16**0

String escape character meaning

\ ' single quotation mark

\ ' double quotes

\a emits system ring tones

\b backspace

\ n line break

\ t horizontal tab (tab)

\v Portrait Tab

\ r return character

\f page Break

\o the characters represented by the octal number

\x hexadecimal number represents the character

\ s represents a null character

\ \ Counter slash

Python formatted format and binary conversion