Python Project Series #50: String - finding index in Python
In Python, you can find the position of a substring within a string using the find() and index() methods. Both return the starting index of the first occurrence of the substring, but they handle missing substrings differently.
find() Method
Returns the index if the substring is found; otherwise, it returns -1.
text = "Hello, world!"
print(text.find("world")) # Output: 7
print(text.find("Python")) # Output: -1 (not found)
index() Method
Works similarly to find(), but raises a ValueError if the substring is not found.
print(text.index("world")) # Output: 7
print(text.index("Python")) # Raises ValueError
Both methods accept optional start and end parameters to limit the search range.
print(text.find("o", 5)) # Searches for 'o' starting from index 5
These methods are useful for text processing, data parsing, and substring validation when working with strings in Python.
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