Python字符串替换字典：跳过键和离开格式化程序答案

【问题标题】：Python String Substitute Dict: Skip Key and Leave FormatterPython字符串替换字典：跳过键和离开格式化程序
【发布时间】：2012-12-17 03:34:53
【问题描述】：

我是一个需要几个值的字符串替代品，我想知道是否可以跳过一个键并将其留在那里，而不是用空格填充它？

s='%(name)s has a %(animal)s that is %(animal_age)s years old'

#skip the animal value
s = s % {'name': 'Dolly', 'animal': 'bird'}#, 'animal_age': 10}

print s

预期输出：

Dolly has a bird that is %(animal_age)s years old

【问题讨论】：

您的意思是在此处跳过animal_age 值？
对了，有没有办法做到这一点？

标签： python string string-formatting string-substitution

【解决方案1】：

您可以在字符串中使用两个%% 来跳过字符串格式化。：

In [169]: s='%(name)s has a %(animal)s that is %%(animal_age)s years old'

In [170]: s % {'name': 'Dolly', 'animal': 'bird', 'animal_age': 10}

Out[170]: 'Dolly has a bird that is %(animal_age)s years old'

或使用string.format():

In [172]: s='{name} has a {animal} that is %(animal_age)s years old'

In [173]: dic = {'animal': 'bird', 'animal_age': 10, 'name': 'Dolly'}

In [174]: s.format(**dic)
Out[174]: 'Dolly has a bird that is %(animal_age)s years old'

【讨论】：