Consider the following string building statement:
s="svn cp %s/%s/ %s/%s/" % (root_dir, trunk, root_dir, tag)
Using four %s
can be confusing, so I prefer using variable names:
s="svn cp {root_dir}/{trunk}/ {root_dir}/{tag}/".format(**SOME_DICTIONARY)
When root_dir
, tag
and trunk
are defined within the scope of a class, using self.__dict__
works well:
s="svn cp {root_dir}/{trunk}/ {root_dir}/{tag}/".format(**self.__dict__)
But when the variables are local, they are not defined in a dictionary, so I use string concatenation instead:
s="svn cp "+root_dir+"/"+trunk+"/ "+root_dir+"/"+tag+"/"
I find this method quite confusing, but I don't know any way to construct a string using in-line local variables.
How can I construct the string using variable names when the variables are local?
Update : Using the locals()
function did the trick.
Note that mixing local and object variables is allowed! eg,
s="svn cp {self.root_dir}/{trunk}/ {self.root_dir}/{tag}/".format(**locals())
You can use locals()
function
s="svn cp {root_dir}/{trunk}/{root_dir}/{tag}/".format(**locals())
EDIT:
Since python 3.6 you can use string interpolation :
s = f"svn cp {root_dir}/{trunk}/{root_dir}/{tag}/"
你试过s="svn cp {root_dir}/{trunk}/ {root_dir}/{tag}/".format(**locals())
吗?
less cryptic and faster
"my name is {__name__}".format_map(locals())
str.format_map (mapping)
Similar to str.format(**mapping), except that mapping is used directly and not copied to a dict.
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