Python从字符串中删除列表中的字符串

Question

I have a big string and a big list of a stop words. I created a little example below.

s = "I am 20 years old. I live in New York in United States of America."
stop = ["am", "old", "in", "of"]

As you can imagine I want the members in stop out from s. I tried this one.

for word in stop:
    s = s.replace(word,"")

I get this error.

AttributeError: 'list' object has no attribute 'replace'

Answer 1

You need to do the following. Split the s to a list of words by . Then create a hash from the list of stop words. Then iterate through the list and if the value not in hash - leave it.

s = "I am 20 years old. I live in New York in United States of America."
stop = ["am", "old", "in", "of"]
arr = s.split(' ')
h = {i: 1 for i in stop}

result = []
for i in arr:
    if i not in h:
        result.append(i)

print ' '.join(result)

Answer 2

s is a list when you write s.replace(), so you probably made change to s, and it s now a list instead of a string

this code works well:

s = "I am 20 years old. I live in New York in United States of America."
stop = ["am", "old", "in", "of"]
for word in stop:
    s = s.replace(word,"")

try to find where you make modification of s, search for an assignment somewhere in your code

Answer 3

Demo here

The most elegant way would be to use set difference .

z = list(set(string.split()) - set(stop))

This would print the following:

['United', '20', 'I', 'live', 'years', 'States', 'America.', 'York', 'New', 'old.']

Unit Test

import unittest

def so_26944574(string):
    stop = ["am", "old", "in", "of"]
    z = list(set(string.split()) - set(stop))
    return sorted(z)

# Unit Test
class Test(unittest.TestCase):
    def testcase(self):
        self.assertEqual(so_26944574("I am 20 years old. I live in New York in United States of America."), sorted(['United', '20', 'I', 'live', 'years', 'States', 'America.', 'York', 'New', 'old.']))
        self.assertEqual(so_26944574("I am very old but still strong, kind of"), sorted(['I', 'very', 'but', 'still', 'strong,', 'kind']))
unittest.main()

Test Pass

Ran 1 test in 0.000s

OK

Answer 4

Another way would be to do this:

s = "I am 20 years old. I live in New York in United States of America."
stop = ["am", "old", "in", "of"]
s_list = s.split() # turn string into list
s = ' '.join([word for word in s_list if word not in stop]) # Make new string
>>> s
'I 20 years old. I live New York United States America.'