message = "hello %s , how are you %s, welcome %s"%("john","john","john")
What is the most pythonic way to avoid specifying "john" 3 times and instead to specify one phrase.
避免三次指定“john”而指定一个短语的最python化的方法是什么?
4 个解决方案
#1
11
"hello %(name)s , how are you %(name)s, welcome %(name)s" % {"name": "john"}
'hello john, how are you john, welcome john'
This is another way to do this without using format.
这是另一种不用格式的方法。
#2
24
I wouldn't use % formatting, .format has many advantages. Also % formatting was originally planned to be removed with .format replacing it, although apparently this hasn't actually happened.
我不会使用% formatting， .format有很多优点。同样，% formatting原本计划用.format替换它来删除，但是显然这并没有发生。
A new system for built-in string formatting operations replaces the
%string formatting operator. (However, the%operator is still supported; it will be deprecated in Python 3.1 and removed from the language at some later time.) Read PEP 3101 for the full scoop.一个用于内置字符串格式化操作的新系统将替换% string格式化操作符。(但仍支持%运算符;它将在Python 3.1中被弃用，并在以后的某个时候从语言中删除。阅读PEP 3101获取完整的独家新闻。
>>> "hello {name}, how are you {name}, welcome {name}".format(name='john')
'hello john, how are you john, welcome john'
I prefer the first way since it is explicit, but here is a reason why .format is superior over % formatting
我喜欢第一种方式，因为它是显式的，但是这里有一个原因，为什么.format优于% formatting
>>> "hello {0}, how are you {0}, welcome {0}".format('john')
'hello john, how are you john, welcome john'
#3
3
This works also:
这个作品也:
"hello %s , how are you %s, welcome %s"%tuple(["john"]*3)
or even shorter, without the explicit type cast:
甚至更短，没有明确的类型cast:
"hello %s , how are you %s, welcome %s"%(("john",)*3)
#4
1
99% likely you should use .format()
99%可能你应该使用。format()
It's unlikely but if you had a series of greetings you could try this:
这不太可能，但如果你有一系列的问候，你可以试试这个:
>>> greetings = ["hello", "how are you", "welcome"]
>>> ", ".join(" ".join((greet, "John")) for greet in greetings)
'hello John, how are you John, welcome John'
#1
11
"hello %(name)s , how are you %(name)s, welcome %(name)s" % {"name": "john"}
'hello john, how are you john, welcome john'
This is another way to do this without using format.
这是另一种不用格式的方法。
#2
24
I wouldn't use % formatting, .format has many advantages. Also % formatting was originally planned to be removed with .format replacing it, although apparently this hasn't actually happened.
我不会使用% formatting， .format有很多优点。同样，% formatting原本计划用.format替换它来删除，但是显然这并没有发生。
A new system for built-in string formatting operations replaces the
%string formatting operator. (However, the%operator is still supported; it will be deprecated in Python 3.1 and removed from the language at some later time.) Read PEP 3101 for the full scoop.一个用于内置字符串格式化操作的新系统将替换% string格式化操作符。(但仍支持%运算符;它将在Python 3.1中被弃用，并在以后的某个时候从语言中删除。阅读PEP 3101获取完整的独家新闻。
>>> "hello {name}, how are you {name}, welcome {name}".format(name='john')
'hello john, how are you john, welcome john'
I prefer the first way since it is explicit, but here is a reason why .format is superior over % formatting
我喜欢第一种方式，因为它是显式的，但是这里有一个原因，为什么.format优于% formatting
>>> "hello {0}, how are you {0}, welcome {0}".format('john')
'hello john, how are you john, welcome john'
#3
3
This works also:
这个作品也:
"hello %s , how are you %s, welcome %s"%tuple(["john"]*3)
or even shorter, without the explicit type cast:
甚至更短，没有明确的类型cast:
"hello %s , how are you %s, welcome %s"%(("john",)*3)
#4
1
99% likely you should use .format()
99%可能你应该使用。format()
It's unlikely but if you had a series of greetings you could try this:
这不太可能，但如果你有一系列的问候，你可以试试这个:
>>> greetings = ["hello", "how are you", "welcome"]
>>> ", ".join(" ".join((greet, "John")) for greet in greetings)
'hello John, how are you John, welcome John'