Python - String Immutability





In python, the string data types are immutable. Which means a string value cannot be updated. We can verify this by trying to update a part of the string which will led us to an error.

# Can not reassign 
t= "Tutorialspoint"
print type(t)
t[0] = "M"

When we run the above program, we get the following output −


t[0] = "M"
TypeError: 'str' object does not support item assignment

We can further verify this by checking the memory location address of the position of the letters of the string.

.
x = 'banana'

for idx in range (0,5):
    print x[idx], "=", id(x[idx])

When we run the above program we get the following output. As you can see above a and a point to same location. Also N and N also point to the same location.

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b = 91909376
a = 91836864
n = 91259888
a = 91836864
n = 91259888


Frequently Asked Questions

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Ans: Python Text Processing Tutorial for Beginners - Learn Python Text Processing in simple and easy steps starting from basic to advanced concepts with examples including Text Processing,Text Processing Environment,String Immutability,Sorting Lines,Reformatting Paragraphs,Counting Token in Paragraphs ,Convert Binary to ASCII,Convert ASCII to Binary,Strings as Files,Backward File Reading,Filter Duplicate Words,Extract Emails from Text,Extract URL from Text,Pretty Print Numbers,Text Processing State Machine,Capitalize and Translate,Tokenization,Remove Stopwords,Synonyms and Antonyms,Text Translation,Word Replacement,Spelling Check,WordNet Interface,Corpora Access,Tagging Words,Chunks and Chinks,Chunk Classification,Text Classification,Bigrams,Process PDF,Process Word Document,Reading RSS feed,Sentiment Analysis,Search and Match,Text Munging,Text wrapping,Frequency Distribution,Text Summarization,Stemming Algorithms,Constrained Search. view more..
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