By: Kareem in Python Tutorials on 2012-04-07
Python does not have a
goto statement like some other programming languages. The use of
goto can make code harder to understand and modify, and can lead to problems such as infinite loops.
However, Python provides alternatives to the
goto statement for most use cases. For example, to break out of nested loops, you can use the
break statement with a label to indicate which loop to break out of:
for i in range(10): for j in range(10): if i * j > 50: break outer print(i, j) outer: print("Done")
In this example, the
break statement is used with the label
outer to break out of both loops when
i * j > 50. The program then continues execution after the
Another alternative to the
goto statement is to use functions or loops to structure your code in a more understandable way. By using functions, you can break up your code into smaller, more manageable chunks, and by using loops you can repeat code blocks without the need for a
You can also use exceptions to provide a 'structured goto' that even works across function calls. Many feel that exceptions can conveniently emulate all reasonable uses of the 'go' or 'goto' constructs of C, Fortran, and other languages. For example:
class label: pass # declare a label try: ... if (condition): raise label() # goto label ... except label: # where to goto pass ...
This doesn't allow you to jump into the middle of a loop, but that's usually considered an abuse of goto anyway. Use sparingly.
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