In This Article You Will Learn About Python String Method strip(), maketrans(), partition(), find(), replace(), index()
Python String Method – Before moving ahead, let’s know a little bit about Isspace(), Istitle(), Join(), Just(), Lower()
strip() method – It returns copy of original string after removing unnecessary characters (space is the default leading character to remove).
Syntax - string.strip( characters ) Parameter Values - characters - It is optional argument. A set of unnecessary characters to be removed.
Example 1- It removes spaces to the left of the string.
x = ' Python'
z = x.strip()
print('I like', z , 'language')
Example 2- Using strip() method to remove unnecessary punctuation.
x = ",,,,,httyuhd.....python"
z = x.strip(' , ')
print(z)
maketrans() method – It returns a mapping table for translation to be used in translations.
Syntax - string.maketrans(x[, y[, z]]). Variable y and z are optional arguments. x - It is the first argument and passed it in dictionary. y - It is the second argument and passed it in string. z - It is the third argument and passed it as mapping to none.
Example 1- Using maketrans() method passing argument as dictionary.
x = {"p": "972", "q": "871", "r": "463"}
z = "pqr"
print(z.maketrans(x))
Example 2- Using maketrans() method passing argument as string.
x = 'pqr' y = "def" z = 'pqr' print(z.maketrans(x, y))
Example 3- Using maketrans() method passing argument as dictionary.
x = "pqr" y = "jes" z = "pqr" print(z.maketrans(x, y))
partition() method – It searched specified string, and splits the string in three character containing a tuple.
First part - It returns the part of before spilt. In other words, from starting to till the point spilt. Second part - It returns the spilt part or specified string. Third part - It returns the part of after spilt. In other words, from the point after the spilt to till last.
Syntax - string.partition( value ) Parameter Values - value - It is required argument. It searches for string.
Note: – This method search for the first occurrence of the specified string.
Example 1- Use of partition() method to search the specified string or word and return three elements containing tuple.
x = 'python is a programming language' z = 'programming' print(x.partition(z))
Example 2- Check If specified value not found in string.
x = 'python is a programming language' z = 'computer' print(x.partition(z))
replace() method – It returns replaces version of old string into new string. In other words, it replaces old specified string into new specified string.
Syntax - string.replace(old string, new string, count) Parameter Values - old string - It is required argument. The string to be changed into new string. new string - It is required argument. The string which changed old string. count - It is optional argument. It is specified a number of occurrences of the old value to be replaced. As default it counts all occurrence.
Example 1- Using replace() method to replace old string in the new string.
x = 'python is a programming language.'
print(x.replace('programming', 'computer'))
Example 2- It replaces all occurrence of the word ‘Python’
x = 'Python is a Python language.'
print(x.replace('Python', 'computer'))
Example 3- It replaces old string in the new string between specified range.
x = 'Python is a Python language.'
print(x.replace('Python', 'computer', 1))
rfind() method – It returns the highest index number of first most last occurrence specified substring. If value not found it returns -1.
Note: rfind() and rindex() method is almost same but difference is that, rfind() returns returns -1 if value not found but rindex() raised an error.
Syntax - string.rfind( value, start, end ) Parameter Values - value - It is required argument to search for. start - It is optional argument for at what position search is starts. If no position to start, default is 0. end - It is optional argument. for at what position search is ends. Default is to the end of the string.
Example 1- Check at what last position letter “a” is appeared in given string.
x = 'python is a language.'
z = x.rfind('a')
print(z)
Example 2- Check at what last position letter “a” is appeared between the range in given string.
x = 'python is a language.'
z = x.rfind('a', 7, 21)
print(z)
Example 3- Check if value is not found, it returns -1. But the rindex() method will raise an exception:
x = 'python is a language.'
z = x.rfind('k')
y = x.rindex('k')
print(z)
print(y)
rindex() method – It returns the index number of specified value of last occurrence.
Syntax - string.rindex(value, start, end) Parameter Values - value - It is required argument. It is specified value search for. start - It is optional argument. At what position start for. end - It is optional argument. At what position end for.
Example 1- Getting index number of specified value (‘o’) of first last occurrence.
x = 'Hello, python world'
z = x.rindex('o')
print(z)
Example 2- It returns the index number of specified value of first last occurrence between range in given string.
x = 'Hello, python world'
z = x.rindex('o', 5, 18)
print(z)
Note: rindex() and rfind() method is almost same but difference is that, rindex() raised an error if value not found whereas rfind() returns -1.
Example 3- Check if value is not found, it returns an error. But the rfind() method returned -1.
x = 'python is a language.'
z = x.rindex('k')
y = x.rfind('k')
print(z)
print(y)
If you find anything incorrect in above discussed topic and have any further question, please comment down below.
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