I have two lists:
wrong_chars = [
['أ','إ','ٱ','ٲ','ٳ','ٵ'],
['ٮ','ݕ','ݖ','ﭒ','ﭓ','ﭔ'],
['ڀ','ݐ','ݔ','ﭖ','ﭗ','ﭘ'],
['ٹ','ٺ','ٻ','ټ','ݓ','ﭞ'],
]
true_chars = [
['ا'],
['ب'],
['پ'],
['ت'],
]
For a given string I want to replace the entries in wrong_chars with those in true_chars. Is there a clean way to do that in python?
string module to the rescue!
There's a really handy function as a part of the string module called translate that does exactly what you're looking for, though you'll have to pass in your translation mapping as a dictionary.
The documentation is here
An example based on a tutorial from tutoriapoint is shown below:
>>> from string import maketrans
>>> trantab = maketrans("aeiou", "12345")
>>> "this is string example....wow!!!".translate(trantab)
th3s 3s str3ng 2x1mpl2....w4w!!!
It looks like you're using unicode here though, which works slightly differently. You can look at this question to get a sense, but here's an example that should work for you more specifically:
translation_dict = {}
for i, char_list in enumerate(wrong_chars):
for char in char_list:
translation_dict[ord(char)] = true_chars[i]
example.translate(translation_dict)
translation_dict[ord(char.decode('utf-8'))] = true_chars[i]. This is true? and i get error: expected a character buffer object in this line
string module does not contain maketrans function in python 3, rather it is available in python2. If anyone is interested in using maketrans, they need call this function on str: str.maketrans(...)I merged your two wrong and true chars in a list of dictionaries of wrongs and what should be replaced with them. so here you are:
link to a working sample http://ideone.com/mz7E0R
and code itself
given_string = "ayznobcyn"
correction_list = [
{"wrongs":['x','y','z'],"true":'x'},
{"wrongs":['m','n','o'],"true":'m'},
{"wrongs":['q','r','s','t'],"true":'q'}
]
processed_string = ""
true_char = ""
for s in given_string:
for correction in correction_list:
true_char=s
if s in correction['wrongs']:
true_char=correction['true']
break
processed_string+=true_char
print given_string
print processed_string
this code can be more optimized and of course i do not care about unicode problems if there was any, because i see you are using Farsi. you should take care about that.
#!/usr/bin/env python
from __future__ import unicode_literals
wrong_chars = [
['1', '2', '3'],
['4', '5', '6'],
['7'],
]
true_chars = 'abc'
table = {}
for keys, value in zip(wrong_chars, true_chars):
table.update(dict.fromkeys(map(ord, keys), value))
print("123456789".translate(table))
aaabbbc89
from __future__ import unicode_literals at the top in your code?'abc' as a shortcut for ['a', 'b', 'c']). Use a list, to see the character boundaries: ideone.com/cweBU9 If a "wrong character" contains more than one Unicode codepoint then you could use text.replace(multiple_codepoints, true_char) or re.sub("|".join(map(re.escape, ['1', '2', '3'])), 'a', text)In my idea you can make just one list that contain true characters too like this:
NewChars = {["ا"،"أ"،"إ"،"آ"], ["ب"،"بِ"،"بِ"،]}
# add all true characters to the first of lists and add all lists to a dict, then:
Ch="إ"
For L in NewChars:
If Ch in L: return L[0]
