打印格式化的字典键

Question

Basically I want to print a value in a dictionary based on a separate variable.
For example:

d={"key1":5, "key2":5}  
x=2  
print("The value is {%d}".format(d["key{%d}".format(x)]))  

I would like this to output "The value is 5", but it tells me that %d is not part of the key. Is there
any way to make it print what I want it to print?

Answer 1

The problem is with the format strings. You are mixing the old-style % format strings with the new str.format method. Use correct format strings and it will work:

>>> print("The value is {}".format(d["key{}".format(x)]))
The value is 5

or with old-style formatting:

>>> print("The value is %d" % d["key%d" % x])
The value is 5