Python String startswith() Method

26-01-23 Ahmed Obaid 1068 0
words: 361 | reading time: 4 minute

​The startswith() function checks if a string starts with a prefix. If so, startswith() will return the boolean True, otherwise it will return the boolean false.


How to formulate it like this:


string.startswith(prefix, start, end)

prefix: A word, string, or tuple that must be checked

start: [Optional] Start the index where the search starts.

end: [optional] The end of the index where the search stops.

Return value: Returns a boolean value that is either true or false.


In the following example we will check if a string starts with "learn". If it is, startswith() will return the boolean True, otherwise it will return the boolean false.

Example:


# Define a variable
string1 = "learn python with ahmad  obaid"
# startswith function call
print(string1.startswith("learn")) # returns True
# Define a variable
string2 = "Hello Python"
# startswith function call
print(string2.startswith("learn")) # returns False

The output will be:


True
False

In the following example we will check if the given word is between the starting indexundefined Finally, if it is, the startswith() function will return the boolean True, and if it is not, it will return the boolean false.

 Example:


# startswith function call  
string = "learn python with ahmad  obaid"
# startswith function call  
print(string.startswith('python' , 6)) # returns True
# startswith function call 
print(string.startswith('ahmad' , 18, 23)) # returns True
# startswith function call 
print(string.startswith('learn' , 0, 6)) # returns True

 The output will be:


True
True
True

 In the following example we will check if the string contains a tuple. That is, if the string starts with any element of the tuple, the startswith() function will return the boolean value True, and if it is otherwise, it will return the boolean value false

 Example:


# Define a variable  
string = "learn python with ahmad  obaid"
# startswith function call
result = string.startswith(( 'Hello', 'python', 'learn', 'mango')) # returns True 
# Print the result
print(result)
# Define a variable  
string = "ahmad"
# startswith function call 
result = string.startswith(('e', 'a', 'i', 'o', 'u')) # returns True
# Print the result
print(result)
# Define a variable 
string = "python"
# startswith function call 
result = string.startswith(('e', 'a', 'i', 'o', 'u')) # returns False
# Print the result
print(result)

 The output will be:


True
True
False

 External sources:

 Built-in functions - official Python documentation

 If you have any questions or concerns, leave them in the comments

Tags

Python python data types Python String string methods python python string startswith method String comparison functions in Python

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