How to change value of dictionary in python?-CodePudding

I find to find some words in dictionary and replace the with another words . wrote the following code, but there is no change in the output. I don't know how can I change the output?

for elem in output:
    for el in elem ['tags']:
        if el== 'datamining':
            el='data mining'
        elif el== 'data science':
            el='data mining'

print(output)

new words

d = {
    'datamining': 'data mining',
    'data science': 'data mining',
}

dictionary

[{'title': 'title1',
  'tags': ['datamining', 'data science'
   'test\u20',
   'data mining',
   'test1']},
 {'title': 'title2',
  'tags': ['title2',
   'datamining\u20]
 }
  ]

expected dictionary

[{'title': 'title1',
  'tags': ['data mining', 'data mining'
   'test\u20',
   'data mining',
   'test1']},
 {'title': 'title2',
  'tags': ['title2',
   'data mining\u20]
 }
  ]

CodePudding user response：

This should do the trick

for i, elem in enumerate(output):
    for j, el in enumerate(elem ['tags']):
        if 'datamining' in el:
            output[i]['tags'][j]='data mining'
        elif 'data science' in el:
            output[i]['tags'][j]='data mining'

To eliminate the \u20:

for i, elem in enumerate(output):
    for j, el in enumerate(elem ['tags']):
        output[i]['tags'][j] = output[i]['tags'][j].replace("\\u20", "")
        output[i]['tags'][j] = output[i]['tags'][j].replace('datamining', 'data mining')
        output[i]['tags'][j] = output[i]['tags'][j].replace('data science', 'data mining')

CodePudding user response：

for elem in output:
    for idx, el in enumerate(elem['tags'][:]):
        if el == 'datamining':
            elem['tags'][idx] = 'data mining'
        elif el == 'data science':
            elem['tags'][idx] = 'data mining'

since you cant change an object that you are iterating we make a shallow copy with the slice syntax [:]