Python program to split and join a string

In Python, we can use the function split() to split a string and join() to join a string. These functions allow us to easily break a string into smaller parts and then reassemble those parts into a new string. This article will explore ways to split and join a string.

a = "Hello, how are you?"

# Split into words
words = a.split()  
 # Join with a hyphen
b = "-".join(words) 
print(b )

Hello,-how-are-you?

Split the string into a list of strings

Splitting a string can be quite useful sometimes, especially when we need only certain parts of strings. We can do this by using below mentioned methods.

Using string.split( )

split() method splits a string into a list of substrings based on a specified delimiter (by default, it splits by whitespace).

a = "Geeks,for,Geeks"

# Split by comma
b = a.split(",")  
print(b)  

['Geeks', 'for', 'Geeks']

Using splitlines( )

The splitlines() method splits the string at line breaks and returns a list of lines. This is useful while using multiple strings.

a = "Geeks\nfor\nGeeks"

 # multiline string
result = a.splitlines()
print(result) 

['Geeks', 'for', 'Geeks']

Join the list of strings into a string

After splitting a string into smaller parts, we might want to join those parts back together. This is commonly done with a delimiter between the parts.

Using join() method

The most common and efficient way to join a list of strings with a delimiter is using the join() method. This method is available for strings and allows we to specify the delimiter we want to use between elements.

a = ['Geeks', 'for', 'Geeks']

# Join with a space
result = " ".join(a)  
print(result) 

us

Geeks for Geeks

Using for loop [Less Efficient]

Although less efficient, we can manually join the strings in a list using a for loop. This method allows we to apply more complex transformations during the joining process.

a = ['Geeks', 'for', 'Geeks']

# Manually join strings with a space 
# (less efficient, but illustrative)
result = ""
for i, word in enumerate(a):
    result += word
    
    # Add space between words except at the end
    if i < len(a) - 1:  
        result += " "

print(result) 

Geeks for Geeks

GeeksforGeeks

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Article Tags :

• DSA
• Python
• Python Programs
• Technical Scripter
• Python string-programs
• python-string

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