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strformat.py
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70 lines (61 loc) · 2.25 KB
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
Topic: 字符串格式化
Desc :
"""
__author__ = 'Xiong Neng'
def simple():
# 一般的%形式的格式化
a = 42
b = 13.142783
c = 'hello'
d = {'x': 13, 'y': 1.54321, 'z': 'world'}
e = 32543263552354234
print('a is %d' % a)
print('%10d %f' % (a, b)) # 最小宽度是10，默认空格补全，右对齐
print('%+010d %E' % (a, b)) # 0补齐， %E科学计数法
# x左对齐， y最大位数是3(整数和小数位和)
# 注意，只有%f %e %E是浮点数，%0.3表示小数点后面位数是3，其他数值类型是表示所有数值位个数
print('%(x)-10d %(y)0.3g' % d)
print('%0.4s %s' % (c, d['z'])) # 字符串c最大字符个数4,
print('%*.*f' % (5, 3, b)) # 用后面的参数填充前面格式串
print('e = %d' % e)
stock = {
'name': 'Good',
'shares': 100,
'price': 490.10
}
print('%(shares)d of %(name)s at %(price)0.2f' % stock)
# 还可使用var()函数
name = 'Elwood'
age = 99
print('%(name)s is %(age)s years old.' % vars())
# print('{0} {1} {2}'.format())
def senior():
"""高级字符串格式化"""
print('{0} {1} {2}'.format('Good', 100, 490.10))
print('{name} {shares} {price}'.format(name='Good', shares=100, price=490.1))
print('Hello {0}, your age is {age}'.format('Elwood', age=47))
print('Use {{ and }} to output single curly braces'.format())
stock = {
'name': 'Good',
'shares': 100,
'price': 490.10
}
print('{name} {shares} {price}'.format(**stock))
x = 3 + 4.2j
print('{0.real} {0.imag}'.format(x))
print('{name:8} {shares:8d} {price:8.2f}'.format(**stock))
# 格式说明：[fill[align]][sign][0][width][.precision][type]
# fill填充空白，align可取<或>或^表示左对齐，右对齐，中间对齐
# width指定最小字段宽度
# type就是d b o x f e E之类的，但有个%指的是变成百分之多少形式
name = 'Elwood'
print('{0:<10}'.format(name))
print('{0:=^10}'.format(name)) # 中间对齐，并用=填充两边
y = 3.1415926
print('{0:{width}.{precision}f}'.format(y, width=10, precision=3))
if __name__ == '__main__':
simple()
senior()