计算范围内具有特定值的键的数量

Question

I have the following problem. I have a dictionary with coordinates as keys and values that lay between 0 and something like 0.0026. Now I want to count the number of keys that have values between 0.0013 and 0.0026 for example. How can I do that?

For example:

dict1 ={(0,1,2):"0.0026",(0,4,2):"0.0011",(0,5,2):"0.0018"}

Answer 1

You could simply use a sum with a conditional generator expression:

>>> sum(1 for val in dict1.values() if 0.0013 < float(val) < 0.0026)
1

If you want to use "normal" for -loops you could also use:

sum_ = 0
for val in dict1.values():
    if 0.0013 < float(val) < 0.0026:
        sum_ += 1

Depending on your understanding of "between" you need to change the < to <= .