Numeric Variables

a = 1, b = 2
c = a + b
>>> print(c)
3

 int( variable )

[string_multiply]:
 input_string = input("What's your greeting?")
 count = input("How many times to repeat it?")
 print( input_string * int(count) )

>>> What's your greeting?
Hello
>>> How many times to repeat it?
>>> 3
Hello! Hello! Hello!

# In Python 3, dividing two integers gives back a float.

Exceptions

try , except

[percent_letter]:
user_string = input("What's your word? ")
user_num = input("What's your number? ")
try:
   real_num = int(user_num)
except:
   real_num = float(user_num)

if not '.' in user_num:
   print(user_string[real_num ])
else:
   ratio = round( len(user_string) * real_num )
   print(user_string[ratio])

Multiple Exceptions

def oh_no(arg):
  try: 
    return int(arg)
  except ValueError: 
    return "Invalid int!"
  except TypeError:
    return "That's not a string or a number!"

Using Else

The command that comes after else is what executes if the try was carried out without exceptions.

def oh_no(arg):
  try: 
    num = int(input("Enter a number: "))
  except ValueError:
    return "That is not a number!"
  else:
    return num