Several methods of formatting output mainly introduce the use of the Format function

1 str self-function formatted output rjust () ljust () center () Zfill ()

The Zfill is zero-padded

Introduced:

Rjust (...)

S.rjust (width[, Fillchar]), string

Format the output to the string, do not handle the string itself, just return a formatted string, you can specify the string width, and specify the padding character, the default padding space!

Action: Aligning the output

Example:

in [+]: s1= "1" in [+]: s2= "1234" in [Page]: s1out[28]: ' 1 ' in []: s2out[29]: ' 1234 ' in [+]: For i in S1,S2:        ....: Print I ...: 11234# left-aligned output, less than 4, default padding space in [+]: For i in S1,s2: ....: Print I.rjust (4) ....: 11234

#填充其他字符

in [+]: S1.rjust (4, "*") out[35]: ' ***1 '

#补齐0

In [a]: S1.zfill (4) out[38]: ' 0001 '

Equals

In [MAX]: S1.rjust (4, ' 0 ') out[40]: ' 0001 '

2 float type Specify width output

In [approx]: 1.0/3out[36]: 0.33333333333333331In [PNS]: "%.3f"% (1.0/3) out[37]: ' 0.333 '

3 Format function formatted output, format is a bit like C language, substitution of variables

It is also a function of STR, which can be used more and more

It replaces% with {} and:.

By location

in [+]: print ' {0} is a {1} '. Format (' Cat ', ' animal ') cat is a animal

in [+]: print ' {1} is a {0} '. Format (' Cat ', ' animal ') animal is a cat

Explanation: The contents of {} will be replaced by the parameters in format (), you can fill in the number in ' {} ' to specify the position in format (), but if the contents of the key parameter inside ' {} ' are replaced by the value values in format ()

by keyword parameter

in [+]: print ' {name} is a {age} '. Format (name= ' Andy ', age=20) Andy is a 20

by subscript

in []: L = [' Andy ', ' good ']in []: ' {0[0]} {0[1]} {0[0]} '. Format (l) out[60]: ' Andy good Andy '

Format qualifier

It has a rich "format qualifier" (syntax is {} with:), such as:

Fill and align

Padding is used in conjunction with alignment

^, <, > center, Align Left, right, back with width

: The fill character after the number, only one character, not specified by default is filled with a space

Like what

in [+]: ' {: >8} '. Format (' 189 ') out[15]: ' 189 ' in [+]: ' {: 0>8} '. Format (' 189 ') out[16]: ' 00000189 ' in [+]: ' {: a>8 } '. Format (' 189 ') out[17]: ' aaaaa189 '

Accuracy and type F

Accuracy is often used in conjunction with Type F

in []: ' {:. 2f} '. Format (321.33345) out[44]: ' 321.33 '

Where. 2 represents a precision of 2 length, and F represents a float type.

Other types

Mainly in the system, B, D, O, X are binary, decimal, octal, hexadecimal.

In [si]: ' {: b} '. Format (out[54]: ' 10001 ' in []: ' {:d} '. Format (+) out[55]: ' + ' in [+]: ' {: o} '. Format (+) out[56]: ' 21 ' In []: ' {: x} '. Format (out[57]: ' 11 '

Use, the number can also be used to make the amount of thousands separator.

in [+]: ' {:,} '. Format (1234567890) out[47]: ' 1,234,567,890 '

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Several methods of formatting output mainly introduce the use of the Format function