Python's method for deleting everything before or after a specified character

To delete everything after a character in a string:

• Use the () method to split a string on delimiters.
• Accesses the list element at index 0 to get everything before the separator.
• Alternatively, use the add + operator to add a separator.

my_str = 'fql!jiyik!com'

separator = '!'

result = my_str.split(separator, 1)[0]
print(result)  # 👉️ 'fql'

We use the () method to remove the characters (! in the example) ) and everything after that.

() method uses a delimiter to split the string into a list of substrings.

The method uses the following 2 parameters:

• separator splits the string into substrings at each occurrence of the separator.
• maxsplit Maximum maxsplit splits completed (optional)

If no separator is found in the string, a list of only 1 element is returned.

We set the maxsplit parameter to 1 because we only need to split the string once.

This example deletes everything in the string after the first occurrence of the character.

my_str = 'fql!jiyik!com'


separator = '!'
result_1 = my_str.split(separator, 1)[0]
print(result_1)  # 👉️ 'fql'

# 👇️ ['fql', 'jiyik!com']
print(my_str.split(separator, 1))

Removes everything after the character, retaining the separator character

Note that the separator character is not included in the string. If you need to include it, use the addition (+) operator.

my_str = 'fql!jiyik!com'

# ✅ Delete everything after the character, retaining the separator character
separator = '!'

result = my_str.split(separator, 1)[0] + separator
print(result)  # 👉️ fql!

The add + operator can be used to concatenate strings in Python.

Delete everything after the last occurrence of the character

If we need to remove everything in the string after the last occurrence of the character, use the () method.

my_str = 'fql!jiyik!com'

separator = '!'

# ✅ Delete everything after the last occurrence of a character
result = my_str.rsplit(separator, 1)[0]
print(result)  # 👉️ 'fql!jiyik'

The behavior of rsplit() is similar to split() except that it splits from the right side.

() method splits the string from the right, and when maxsplit is set to 1, it splits the string only once.

Delete everything after the last occurrence, retaining separators

If we need to include the characters you split, use the addition operator (+).

my_str = 'fql!jiyik!com'

separator = '!'

result = my_str.rsplit(separator, 1)[0] + separator
print(result)  # 👉️ 'fql!jiyik!'

Use () to remove everything after the character

We can also use the () method to remove everything after a specific character in a string.

my_str = 'fql!jiyik!com'
separator = '!'

result = my_str.partition(separator)[0]
print(result)  # 👉️ 'fql'

result = ''.join(my_str.partition(separator)[0:2])
print(result)  # 👉️ 'fql!'

method splits the string on the first occurrence of the supplied delimiter.

This method returns a tuple with 3 elements - the part before the separator, the separator and the part after the separator.

my_str = 'fql!jiyik!com'
separator = '!'

# 👇️ ('fql', '!', 'jiyik!com')
print(my_str.partition(separator))

If no separator is found in the string, the method returns a tuple containing the string, followed by 2 empty strings.

If we need to include a separator in the result, use the () method to concatenate the first and second list items.

my_str = 'fql!jiyik!com'
separator = '!'

result = ''.join(my_str.partition(separator)[0:2])
print(result)  # 👉️ 'fql!'

method takes an iterable object as an argument and returns a string that is a concatenation of the strings in the iterable object.

The string from which the method is called is used as a separator between elements.

Removing Everything Before a Character in a String in Python

To delete everything before a character in a string:

• Use the () method to get the index of the character.
• Use string slicing and set the starting index to the index of the character.
• The new string will not contain the preceding characters.

my_str = 'apple, banana'

result = my_str[my_str.find('b'):]
print(result)  # 👉️ banana

method returns the index of the first occurrence of the substring provided in the string.

We use string slicing to get a portion of the original string that starts at the index of the character and continues to the end of the string.

Note that the () method returns -1 if no substring is found in the string.

Handling scenarios where characters don't exist

We can handle the case where the find() method returns -1 in an if/else statement.

my_str = 'apple, banana'

index = my_str.find('b')
print(index) # 👉️ 7

if index != -1:
    result = my_str[index:]
else:
    result = my_str
    # 👉️ alternatively raise an error

print(result) # 👉️ 'banana'

This is an example of the case where the supplied character is not in the string.

my_str = 'apple, banana'

index = my_str.find('z')
print(index)  # 👉️ -1

if index != -1:
    result = my_str[index:]
else:
    result = my_str
    # 👉️ alternatively raise an error

print(result)  # 👉️ 'apple, banana'

Our else statement assigns the result variable to the entire string, but, can raise an exception.

my_str = 'apple, banana'

index = my_str.find('z')
print(index)  # 👉️ -1

if index != -1:
    result = my_str[index:]
else:
    # 👇️ this runs
    raise IndexError('provided character not in string')

Delete everything before the last occurrence of the character

If we need to remove everything before the last occurrence of a character, use the () method.

my_str = 'apple,banana,bear'

result = my_str[my_str.rfind('b'):]

print(result) # 👉️ 'bear'

method returns the highest index in the string at which the supplied substring was found.

This method returns -1 if the string does not contain a substring.

We can use if/else statements to handle cases where characters are not present in the string.

my_str = 'apple,banana,bear'

index = my_str.rfind('b')

if index != -1:
    result = my_str[index:]
else:
    result = my_str

print(result)  # 👉️ 'bear'

If the else block runs, we set the result variable to the entire string.

Alternatively, we can raise an error in an else block, such as raise IndexError('your message here').

We can also use the () method to delete everything before the last occurrence of a character.

Use rsplit() to remove everything before the last occurrence of a character

To delete everything before the last occurrence of the character:

• Use the () method to split the string from the right.
• Accesses the list item at index 1.
• The result will be a string containing everything after the last occurrence of the character.

my_str = '/articles/python'

result = my_str.rsplit('/', 1)[1]
print(result)  # 👉️ 'python'

# 👇️ If you want to include this character in the result
result_2 = '/' + my_str.rsplit('/', 1)[1]
print(result_2)  # 👉️ '/python'

# 👇️ ['/articles', 'python']
print(my_str.rsplit('/', 1))

We use the () method to delete everything before the last character appears.

method returns a list of words in a string using the supplied separator as the separator string.

my_str = 'one two three'

print(my_str.rsplit(' '))  # 👉️ ['one', 'two', 'three']
print(my_str.rsplit(' ', 1))  # 👉️ ['one two', 'three']

The method uses the following 2 parameters:

• separator splits the string into substrings at each occurrence of the separator.
• maxsplit Do up to maxsplit splits, rightmost (optional)

The behavior of rsplit() is similar to split() except that it splits from the right side.

Note that we provided a value of 1 for the maxsplit parameter because we only want to split the string from the right side once.

my_str = '/articles/python'

result = my_str.rsplit('/', 1)[1]
print(result)  # 👉️ 'python'

# 👇️ ['/articles', 'python']
print(my_str.rsplit('/', 1))

The final step is to access the list element at index 1 to get a string containing everything after the last occurrence of the specified character.

To include the character in the result, use the add + operator.

my_str = '/articles/python'

result = '/' + my_str.rsplit('/', 1)[1]
print(result)  # 👉️ '/python'

Use rpartition() to remove everything before the last occurrence of a character

Alternatively, we can use the () method.

my_str = '/articles/python'

result = my_str.rpartition('/')[2]
print(result)  # 👉️ 'python'

# 👇️ ('/articles', '/', 'python')
print(my_str.rpartition('/'))

method splits the string at the last occurrence of the supplied delimiter.

This method returns a tuple with 3 elements - the part before the separator, the separator and the part after the separator.

If no separator is found in the string, the method returns a tuple containing two empty strings, followed by the string itself.

If you need to include a separator in the result, use the () method to concatenate the second and third list items.

my_str = '/articles/python'

result = ''.join(my_str.rpartition('/')[1:])
print(result)  # 👉️ '/python'

method takes an iterable object as an argument and returns a string that is a concatenation of the strings in the iterable object.

The string from which the method is called is used as a separator between elements.

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