Which String Concatenation Method in Python is Most Efficient?

How to concatenate strings in Python

Original title: "Which is the preferred way to concatenate a string in Python? [duplicate]"

When dealing with Python strings, it's important to know the most efficient concatenation techniques. There are mainly two options to concatenate a string:

1. Using the ' ' operator

s += "stringfromelsewhere"

This is the most straightforward approach and is generally recommended for performance reasons.

2. Using a list and the 'join' method

s = []
s.append("some string")
s = ''.join(s)

While this method is often claimed to be faster, testing suggests that for most use cases, it is not significantly different from using the ' ' operator.

Performance considerations

Extensive timing tests have shown that for both string methods, concatenation performance is faster in Python 3 than in Python 2. Moreover, there is a significant difference in performance depending on the size of the string being concatenated.

For shorter strings, the ' ' operator is faster, but for longer strings, the difference is negligible.

Conclusion

Based on the testing results, it is generally recommended to use the ' ' operator for string concatenation. The 'append/join' method should only be considered in specific scenarios where it provides clarity or when dealing with extremely long strings in Python 2.

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