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In [1]: import re In [2]: re.sub('a','o','casa') Out[2]: 'coso' In [3]: 'casa'.replace('a','o') Out[3]: 'coso' In [4]: 'Giulio Cesare'.lower() Out[4]: 'giulio cesare' In [5]: a='casa'.replace('a','o') In [6]: a Out[6]: 'coso' In [7]: print(a) coso In [1]: sub('a','o','casa') --------------------------------------------------------------------------- NameError Traceback (most recent call last) Cell In[1], line 1 ----> 1 sub('a','o','casa') NameError: name 'sub' is not defined