CODEWITHSUNDEEP
python
Dennise Arango
Dennise Arango

Reputation: 33

TypeError: cannot perform reduce with flexible type in python

I have an list and through a for loop I must calculate the number of words in that list that have more than five letters and print the number.

but I have an error that is the following:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_5444/3081067402.py in <module>
      7 for i in words:
      8     if len(words)>5:
----> 9         more_than_five.append(words.sum(i))
     10 
     11 print(more_than_five)

C:\ProgramData\Anaconda3\lib\site-packages\numpy\core\_methods.py in _sum(a, axis, dtype, out, keepdims, initial, where)
     45 def _sum(a, axis=None, dtype=None, out=None, keepdims=False,
     46          initial=_NoValue, where=True):
---> 47     return umr_sum(a, axis, dtype, out, keepdims, initial, where)
     48 
     49 def _prod(a, axis=None, dtype=None, out=None, keepdims=False,

TypeError: cannot perform reduce with flexible type

this is my code:

list_countries = 'Japan, Singapore, Maldives, Europe, Italy, Korea'
words = np.array(list_countries.split())

more_than_five = []

for i in words:
    if len(words)>5:
        more_than_five.append(words.sum(i))

print(more_than_five)

What is causing this error? Can someone help me to correct it?

For example: list_countries = 'Japan, Singapore, Maldives, Europe, Italy, Korea the expected output is: 3

Because there are only three words that have more than 5 letters, Singapore, Maldives and Europe.

but instead I get the error that I named them.

Upvotes: 1

Views: 1412

Answers (3)

Kian
Kian

Reputation: 96

Although you've already gotten great solutions to this problem, I thought I'd chime in on what the error means if you run across it in the future. Basically, anytime Python throws a 'TypeError' it means it has ran across a type that confuses it in the given context. In your problem, python is expecting an 'int' or 'float' for the function words.sum(i). However, you have given it a 'str' type, which can't be used for mathematical operations.

Hope this helps in the future!

Upvotes: 0

ML1
ML1

Reputation: 119

First, what you called a list is in fact a string, so you have to change this string into a list

Then,if you just want the number of words that have more than five letters, "more_than_five" should be an "int"

Here is my proposition:

import numpy as np

list_countries = 'Japan, Singapore, Maldives, Europe, Italy, Korea'
list_countries = list_countries.replace(' ', '').split(',')

more_than_five = 0

for words in list_countries:
    if len(words) > 5:
        more_than_five += 1

print(more_than_five)

The output:

3

Upvotes: 2

Anonymous
Anonymous

Reputation: 452

You’re using numpy.Array.sum, when you could just find the length of a normal python list, without numpy.

The easiest fix to preserve what you have would be to only do more_than_5.append(i), then calculate the sum at the end.

However, you could also do:

list_countries = 'Japan, Singapore, Maldives, Europe, Italy, Korea'

print(len(list(filter(lambda i: len(i)>5, list_countries.split(", ")))))

This is essentially the same thing, just shortened down

Upvotes: 0

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