71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 字符串格式化
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Desc :
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"""
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__author__ = 'Xiong Neng'
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def simple():
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# 一般的%形式的格式化
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a = 42
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b = 13.142783
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c = 'hello'
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d = {'x': 13, 'y': 1.54321, 'z': 'world'}
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e = 32543263552354234
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print('a is %d' % a)
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print('%10d %f' % (a, b)) # 最小宽度是10，默认空格补全，右对齐
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print('%+010d %E' % (a, b)) # 0补齐， %E科学计数法
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# x左对齐， y最大位数是3(整数和小数位和)
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# 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
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print('%(x)-10d %(y)0.3g' % d)
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print('%0.4s %s' % (c, d['z'])) # 字符串c最大字符个数4,
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print('%*.*f' % (5, 3, b)) # 用后面的参数填充前面格式串
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print('e = %d' % e)
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stock = {
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'name': 'Good',
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'shares': 100,
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'price': 490.10
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}
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print('%(shares)d of %(name)s at %(price)0.2f' % stock)
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# 还可使用var()函数
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name = 'Elwood'
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age = 99
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print('%(name)s is %(age)s years old.' % vars())
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# print('{0} {1} {2}'.format())
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def senior():
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"""高级字符串格式化"""
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print('{0} {1} {2}'.format('Good', 100, 490.10))
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print('{name} {shares} {price}'.format(name='Good', shares=100, price=490.1))
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print('Hello {0}, your age is {age}'.format('Elwood', age=47))
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print('Use {{ and }} to output single curly braces'.format())
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stock = {
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'name': 'Good',
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'shares': 100,
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'price': 490.10
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}
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print('{name} {shares} {price}'.format(**stock))
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x = 3 + 4.2j
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print('{0.real} {0.imag}'.format(x))
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print('{name:8} {shares:8d} {price:8.2f}'.format(**stock))
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# 格式说明：[fill[align]][sign][0][width][.precision][type]
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# fill填充空白，align可取<或>或^表示左对齐，右对齐，中间对齐
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# width指定最小字段宽度
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# 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
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name = 'Elwood'
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print('{0:<10}'.format(name))
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print('{0:=^10}'.format(name)) # 中间对齐，并用=填充两边
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y = 3.1415926
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print('{0:{width}.{precision}f}'.format(y, width=10, precision=3))
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if __name__ == '__main__':
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simple()
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senior()
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