KeyError: '"param1"' when creating a dictionary string

Question

I need to create a dictionary string:

param1 = "abc"
param2 = "def"
input_data = """{"param1": {}, "param2": {}}""".format(param1, param2)

But I get this error:

KeyError: '"param1"'

Answer 1

You need to escape (double) characters { and } in format strings when they represent themselves (not used for formatting):

param1 = "abc"
param2 = "def"
input_data = """{{"param1": {}, "param2": {}}}""".format(param1, param2)

Answer 2

Your format string is seeing the first { as the start of a formatter, so you have to escape it by using a double {{ :

 input_data = """{{"param1": {}, "param2": {}}}""".format(param1, param2)

Answer 3

try this way.

param1 = "abc", param2 = "def"
input_data = str({"param1": param1, "param2": param2})

Output of input_data :

"{'param1': 'abc', 'param2': 'def'}"