how to set index pandas
# assignment copy
df = df.set_index('month')
# or inplace
df.set_index('month', inplace=True)
# year sale month month year sale
# 0 2012 55 1 1 2012 55
# 1 2014 40 4 => 4 2014 40
# 2 2013 84 7 7 2013 84
# 3 2014 31 10 10 2014 31how to index a set in python
"""
You can't index a set in python.
The concept of sets in Python is inspired in Mathmatics. If you are interested
in knowing if any given item belongs in a set, it shouldn't matter "where" in
the set that item is located. With that being said, if you still want to
accomplish this, this code should work, and, simultaneously, show why it's a
bad idea
"""
def get_set_element_from_index (input_set : set, target_index : int):
if target_index < 0:
target_index = len(input_set) + target_index
index = 0
for element in input_set:
if index == target_index:
return element
index += 1
raise IndexError ('set index out of range')
my_set = {'one','two','three','four','five','six'}
print (my_set) # unpredictable output. Changes everytime you run the script
# let's say the previous print nails the order of the set (same as declared)
print(get_set_element_from_index(my_set, 0)) # prints 'one'
print(get_set_element_from_index(my_set, 3)) # prints 'four'
print(get_set_element_from_index(my_set, -1)) # prints 'six'
print(get_set_element_from_index(my_set, 6)) # raises IndexErrorCopyright © 2021 Codeinu
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