I want to pass a list in a definition function to count the number of digits in a number that's-CodePudding

def count_digit(num):
    if (num//10 == 0):
        return 1
    else:
        return 1   count_digit(num // 10)

i have a list called - filter_stats which looks like :

filter_stats= [1,2,24,2,353,4534,6,65,6457,6,8,58,58,744, and so on]

I want to pass this list in the code above. how do I do that?

when I did this

count_digit(filter_stats)

it shows this: unsupported operand type(s) for //: 'filter' and 'int'

CodePudding user response：

You can use a for loop:

results = []
for num in filter_stats:
    results.append(count_digit(num))

A list comprehension is also an option:

results = [count_digit(num) for num in filter_stats]

Finally, you can also use map if you like functional approaches:

results = list(map(count_digit, filter_stats))

CodePudding user response：

You are passing a list into the count_digit function. So when you divide a list by "// 10", that would give an error. To see the length of a number, you can use the len() function, so e.g. len(str(123)).

So, in your code you have to pass in the list item : e.g: count_digit(filter_stats[4]) => then it works!

you can simplify the function like this:

def count_digit(num):
    return len(str(num))

and then call the function :

count_digit(filter_stats[4])