I am trying to modify all of the elements of the list in Python:
magicians = ['harry potter', 'scamander', 'snape']
for magician in magicians:
magician = 'the Great ' + magician
print(magicians)
but it returns the original list:
['harry potter', 'scamander', 'snape']
Can you please kindly explain this to me step-by-step? This may be a very stupid question you have ever seen. I'm truly sorry for that.
You are only mutating the element in the loop-scope. Instead, reassign using the element index:
magicians = ['harry potter', 'scamander', 'snape']
for i, magician in enumerate(magicians):
magician = 'the Great ' + magician
magicians[i] = magician
print(magicians)
Output:
['the Great harry potter', 'the Great scamander', 'the Great snape']
However, it is much shorter to use list comprehension:
magicians = ['harry potter', 'scamander', 'snape']
new_magicians = ['the Great {}'.format(i) for i in magicians]
Output:
['the Great harry potter', 'the Great scamander', 'the Great snape']
In the scope of the problem, a loop is not even necessary:
final_data = ("the Great {}*"*len(magicians)).format(*magicians).split('*')[:-1]
List comprehension is more pythonic.
magicians = ['harry potter', 'scamander', 'snape']
great_magicians = ['the Great {}'.format(magician) for magician in magicians]
