Home > Article > Backend Development > How Can I Concatenate Strings Efficiently in Python?
Python provides multiple methods for concatenating strings, with varying performance characteristics.
The familiar operator can be used to append one string to another. However, this approach has O(n^2) complexity for multiple concatenations due to the creation of intermediate copies. For example:
<code class="python">var1 = "foo" var2 = "bar" var3 = var1 + var2</code>
CPython, the most popular Python implementation, now optimizes string concatenation for single concatenations to O(n) by extending the string in place. This means the following code is now amortized O(n):
<code class="python">s = "" for i in range(n): s += str(i)</code>
When concatenating multiple strings, consider using efficient alternatives such as the CPython optimization or StringBuilder modules. For smaller concatenations, the standard operator can be used, keeping in mind its performance limitations.
The above is the detailed content of How Can I Concatenate Strings Efficiently in Python?. For more information, please follow other related articles on the PHP Chinese website!