I'm doing a job (Python 3) and I need help completing the codes.
I need to know how to reverse the order, for example 2345 in and out of 5432.
I also need to know how I leave only one uppercase letter and the smallest case, such as: stackoverflow?
And finally I need to know how I change x by y and vice versa. For example: y = 23x^2 - 2x + 1 (input) and x = 23y^2 - 2y + 1 (output).
Thank you in advance.
Invert number (in a function):
def reverse_number(n):
r = 0
while n > 0:
r *= 10
r += n % 10
n /= 10
return r
Leave a capital letter:
u"stackoverflow".title()
Replace x with y and vice versa:
"y = 23x^2 - 2x + 1".upper().replace("X", "y").replace("Y","x")
All lowercase letters except the letter a:
"NAISNDFOAISOASID".lower().replace("a","A")