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Любому покажи += - и он не ошибётся с описанием
Language:
Source:
Errors:
py3
Source:
a = [1, 2, 3]
a += 2
Errors:
Traceback (most recent call last):
File "source_file.py", line 2, in <module>
a += 2
TypeError: 'int' object is not iterable