I want to change an array from lower case to uppercase and print the result in Python.
In the following x will continue to print in lowercase.
x = ['ab', 'cd']
for i in x:
i.upper()
print(x)
How do you write the code so x = ['AB', 'CD] when you print for x?
You need to assign the uppercased characters back to the original string.
x = ['ab', 'cd']
#Loop through x and update element
for idx, item in enumerate(x):
x[idx] = item.upper()
print(x)
Or by using list comprehension
x = ['ab', 'cd']
x = [item.upper() for item in x]
print(x)
The output will be
['AB', 'CD']
list comprehension is best for this.
x = ['ab', 'cd']
x = [i.upper() for i in x]
print(x)
x = ['ab', 'cd']
x = [i.upper() for i in x]
print(x)
output
['AB', 'CD']
Can be done with list comprehensions. These basically in the form of
[function-of-item for item in some-list]
in your case
x = [a,b,c]
[i.upper() for i in x ]
If you don't know how to use list comprehension then you can write:
x = ['ab', 'cd']
result = [] # create list for upper strings
for i in x:
upper_i = i.upper() # create upper string
result.append(upper_i) # add upper string to list
x = result # replace lists
print(x)
