Python function call inside string formatting throws an error

Question

a = ";"
b = ["foo","bar"]
c = f"{a.join(b)}" #works properly "foo;bar"
print(c)

d = {"a":a, "b":b}
c = "{a.join(b)}".format(**d) #CRASH
print(c)

Error: AttributeError: ‘str’ object has no attribute ‘join(b)’

Is there any way to make the second version work? Call .format on a string and have .join work.

Asked By: xyz3lt

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Source

Answer 1

Unfortunately, the format function is not a full-blown python interpreter, it can only access the properties of the given objects, but not execute code. If you want to format your string with the format syntax, you can do it in the following way:

a = ";"
b = [ "foo", "bar" ]
c = "{}".format(a.join(b))
print(c)

Answered By: TopchetoEU

Python function call inside string formatting throws an error

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