How can I loop through a python dictionary and replace a substring value?

Question

I want to loop through a dictionary with unknown keys and replace a specific substring value.

mydict = {
    'Getting links from: https://www.foo.com/': 
    [
        '+-BROKEN- http://www.broken.com/',
        '+---OK--- http://www.set.com/',
        '+---OK--- http://www.one.com/'
    ],
    'Getting links from: https://www.bar.com/': 
    [
        '+-BROKEN- http://www.broken.com/'
    ]
}

val = "+-BROKEN-"

for k, v in mydict.iteritems():
   if v.contains(val):
     v.replace(val, '')

The result I want is:

{
    'Getting links from: https://www.foo.com/':
    [
        'http://www.broken.com/',
        '+---OK--- http://www.set.com/',
        '+---OK--- http://www.one.com/'
    ], 
    'Getting links from: https://www.bar.com/': 
    [
        'http://www.broken.com/'
    ]
}

How can I loop through a dictionary and replace a specific substring value?

g.d.d.c · Accepted Answer · 2019-01-02 20:40:18Z

3

It's not working like you expect because v is a list, not a single string. For that reason, v.contains(val) is always False. One way to accomplish what you're describing would be:

for k, v in mydict.iteritems():
  for i, s in enumerate(v):
    if val in s:
      v[i] = s.replace(val, '')

answered Jan 2, 2019 at 20:40

g.d.d.c

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2 Comments

lane Over a year ago

This looks great. I'm getting an error, though, because I have an odd character in the string: ├─BROKEN─ error is: UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 0: ordinal not in range(128) I tried s = '├─BROKEN─' val = unicode(s, "utf-8") but same error. Any advice? I'm using 2.7

g.d.d.c Over a year ago

You might try s = u'├─BROKEN─' and see if that does anything for you. You might also try something like finding an example that contains the value you want to replace and assigning it based on a substring. Something like val = mydict.values()[0][0][:10] to get the first ten characters of the first entry in the first list in the dict, for example.

user8261637 · Accepted Answer · 2019-01-02 20:40:33Z

1

Assuming your dictionary values are all lists which contain strings and you want to remove the value from any string containing it, you could try:

for k, v in mydict.iteritems():
    mydict[k] = [string.replace(val,'')] for string in v]

answered Jan 2, 2019 at 20:40

user8261637

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