How to use the isalpha function to remove special characters

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I am trying to remove special characters from each element in a string. The below code does count the elements but i can't get the .isalpha to remove the non alphabetical elements. Is anyone able to assist? Thank you in advance.

input = 'Hello, Goodbye hello hello! bye byebye hello?'
word_list = input.split()

for word in word_list:
    if word.isalpha()==False:
        word[:-1]
di = dict()
for word in word_list:
    di[word] = di.get(word,0)+1

di

It seems you are expecting word[:-1] to remove the last character of word and have that change reflected in the list word_list. However, you have assigned the string in word_list to a new variable called word and therefore the change won't be reflected in the list itself.

A simple fix would be to create a new list and append values into that. Note that your original string is called input which shadows the builtin input() function which is not a good idea:

input_string = 'Hello, Goodbye hello hello! bye byebye hello?'
word_list = input_string.split()
new = []
for word in word_list:
    if word.isalpha() == False:
        new.append(word[:-1])
    else:
        new.append(word)

di = dict()
for word in new:
    di[word] = di.get(word,0)+1

print(di)
# {'byebye': 1, 'bye': 1, 'Hello': 1, 'Goodbye': 1, 'hello': 3}

You could also remove the second for loop and use collections.Counter instead:

from collections import Counter
print(Counter(new))

How to use the isalpha function to remove special characters, I am trying to remove special characters from each element in a string. The below code does count the elements but i can't get the .isalpha to  Python string method isalpha() checks whether the string consists of alphabetic characters only. Syntax. Following is the syntax for islpha() method − str.isalpha() Parameters. NA. Return Value. This method returns true if all characters in the string are alphabetic and there is at least one character, false otherwise. Example

You are nearly there with your for loop. The main stumbling block seems to be that word[:-1] on its own does nothing, you need to store that data somewhere. For example, by appending to a list.

You also need to specify what happens to strings which don't need modifying. I'm also not sure what purpose the dictionary serves.

So here's your for loop re-written:

mystring = 'Hello, Goodbye hello hello! bye byebye hello?'
word_list = mystring.split()

res = []
for word in word_list:
    if not word.isalpha():
        res.append(word[:-1])
    else:
        res.append(word)

mystring_out = ' '.join(res)  # 'Hello Goodbye hello hello bye byebye hello'

The idiomatic way to write the above is via feeding a list comprehension to str.join:

mystring_out = ' '.join([word[:-1] if not word.isalpha() else word \
                         for word in mystring.split()])

It goes without saying that this assumes word.isalpha() returns False due to an unwanted character at the end of a string, and that this is the only scenario you want to consider for special characters.

Python, function to demonstrate removal of characters. # which are not numbers and alphabets using re. getVals = list ([val for val in ini_string. if val.isalpha() or  The isalpha () function checks whether a character is an alphabet or not. In C programming, isalpha () function checks whether a character is an alphabet (a to z and A-Z) or not. If a character passed to isalpha () is an alphabet, it returns a non-zero integer, if not it returns 0. The isalpha () function is defined in <ctype.h> header file.

One solution using re:

In [1]: import re
In [2]: a = 'Hello, Goodbye hello hello! bye byebye hello?'
In [3]: ' '.join([i for i in re.split(r'[^A-Za-z]', a) if i])
Out[3]: 'Hello Goodbye hello hello bye byebye hello'

Python, Pandas str.isalpha() method is used to check if all characters in each string in series after that the white spaces are removed using str.replace() method and then a the bool series in only false where the string is having special characters. Python String isalpha () and its application. In Python, isalpha () is a built-in method used for string handling. The isalpha () methods returns “True” if all characters in the string are alphabets, Otherwise, It returns “False”. This function is used to check if the argument includes only alphabet characters (mentioned below).

Python String isalpha() Method, Definition and Usage. The isalpha() method returns True if all the characters are alphabet letters (a-z). Example of characters that are not alphabet letters:  isalpha () Prototype. The isalpha () function checks if ch is an alphabetic character or not as classified by the currently installed C locale. By default, the characters are alphabets: The behaviour of isalpha () is undefined if the value of ch is not representable as unsigned char or is not equal to EOF. It is defined in <cctype> header file.

Python String isalpha(), True if all characters in the string are alphabets (can be both lowercase and uppercase). False if at least one character is not alphabet. Example 1: Working of​  mystring_out = ' '.join([word[:-1] if not word.isalpha() else word \ for word in mystring.split()]) It goes without saying that this assumes word.isalpha() returns False due to an unwanted character at the end of a string, and that this is the only scenario you want to consider for special characters.

Remove non-letters from a string, What links here · Related changes · Special pages This code removes common symbols and numbers from a string, returning letters only. for c in id_tab if c.isalpha()); print s.translate(id_tab, tostrip); # Using regular expressions Public Function ReturnAlpha(ByVar sString As String) As String; Dim i As  Using other locales, an alphabetic character is a character for which isupper or islower would return true, or another character explicitly considered alphabetic by the locale (in this case, the character cannot be iscntrl, isdigit, ispunct or isspace).

Comments
  • you have to do it like this? or regex is allowed?
  • The single line word[:-1] does not do anything, and it's not clear what you think what it should be doing there either.
  • ' '.join([''.join([ch for ch in ss if ch.isalpha()]) for ss in in_str.split()]) and you should avoid using input as a named variable. It is a function in Python.
  • if not word.isalpha(): tests the entire word, but res.append(word[:-1]) always removes the last character. However, it works for OP's example and it's unclear whether this is by design or purely accidental.
  • @usr2564301, Yep, I was in the process of writing an extra sentence (see update). It's obviously an assumption based on current logic.
  • If using re, why not simply kick out all undesired characters instead?
  • are you talking about re.sub to substitute special characters with empty string?