Question

我有一个多行字符串，我想用自己的变量更改它的某些部分。我不太喜欢使用+运算符拼凑相同的文本。有更好的替代方案吗？

例如（内部引用是必要的）：

line = """Hi my name is "{0}".
I am from "{1}".
You must be "{2}"."""

我希望能够多次使用它来形成一个更大的字符串，如下所示：

Hi my name is "Joan".
I am from "USA".
You must be "Victor".

Hi my name is "Victor".
I am from "Russia".
You must be "Joan".

有没有办法做类似的事情：

txt == ""
for ...:
    txt += line.format(name, country, otherName)

Answer 1

info = [['ian','NYC','dan'],['dan','NYC','ian']]
>>> for each in info:
    line.format(*each)


'Hi my name is "ian".\nI am from "NYC".\nYou must be "dan".'
'Hi my name is "dan".\nI am from "NYC".\nYou must be "ian".'

明星运算符会将列表解压缩到format方法。

Answer 2

除了列表，您还可以使用字典。如果您有许多变量可以一次跟踪，这非常有用。

text = """\
Hi my name is "{person_name}"
I am from "{location}"
You must be "{person_met}"\
"""
person = {'person_name': 'Joan', 'location': 'USA', 'person_met': 'Victor'}

print text.format(**person)

注意，我输入的文字不同，因为它让我更容易排列文本。你必须在开头“”“和结尾”“之前加一个'\'。

现在，如果您在列表中有多个词典，则可以轻松完成

people = [{'person_name': 'Joan', 'location': 'USA', 'person_met': 'Victor'},
          {'person_name': 'Victor', 'location': 'Russia', 'person_met': 'Joan'}]

alltext = ""
for person in people:
  alltext += text.format(**person)

或使用列表推导

alltext = [text.format(**person) for person in people]

Answer 3

line = """Hi my name is "{0}".
I am from "{1}".
You must be "{2}"."""

tus = (("Joan","USA","Victor"),
       ("Victor","Russia","Joan"))

lf = line.format # <=== wit, direct access to the right method

print '\n\n'.join(lf(*tu) for tu in tus)

结果

Hi my name is "Joan".
I am from "USA".
You must be "Victor".

Hi my name is "Victor".
I am from "Russia".
You must be "Joan".

在Python中格式化多行字符串的最优雅方式

3 个答案: