How do I call a function inside another function in the same file in Python?

I am trying to break up some code into smaller subprograms within the same file to make it more modular. This is the code I would like to break up:

def time():
    print("This program calculates the number of seconds in a given length of 
        time.\n")
    second = 1
    minute = second * 60
    hour = minute * 60
    day = hour * 24
    week = day * 7
    number1 = (eval(input("Enter a number of weeks: ")))
    calc1 = number1 * week
    number2 = (eval(input("Enter a number of days: ")))
    calc2 = number2 * day
    number3 = (eval(input("Enter a number of hours: ")))
    calc3 = number3 * hour
    number4 = (eval(input("Enter a number of minutes: ")))
    calc4 = number4 * minute
    number5 = (eval(input("Enter a number of seconds: ")))
    calc5 = number5 * second
    sum1 = (calc1 + calc2 + calc3 +calc4 + calc5)
    print("\nIn", number1, "week(s),", number2, "day(s),", number3, "hour(s),", 
        number4, "minute(s), and", number5, "second(s), there are", sum1, 
        "second(s).")

It works the way I want it to when it's all together, but I'd like to break it up somewhere along the lines of this:

def count():
    print("This program calculates the number of seconds in a given length of 
        time.\n")
    second = 1
    minute = second * 60
    hour = minute * 60
    day = hour * 24
    week = day * 7

def number():
    number1 = (eval(input("Enter a number of weeks: ")))
    calc1 = number1 * week
    number2 = (eval(input("Enter a number of days: ")))
    calc2 = number2 * day
    number3 = (eval(input("Enter a number of hours: ")))
    calc3 = number3 * hour
    number4 = (eval(input("Enter a number of minutes: ")))
    calc4 = number4 * minute
    number5 = (eval(input("Enter a number of seconds: ")))
    calc5 = number5 * second
    sum1 = (calc1 + calc2 + calc3 +calc4 + calc5)

def time():
    print("This program calculates the number of seconds in a given length of 
        time.")
    count()
    number()
    print("In,", number1, "weeks,", number2, "days,", number3, "hours,", 
        number4, "minutes, and", number5, "seconds, there are", sum1, 
        "seconds.")

time()

The goal is to run time() and have it call count() and number(), so the code for time() isn't as long. (I know the original code isn't that long, but I'm trying to learn how all this works.)

I've had success calling functions within a file before, but only when it was to print a string, and no math was involved. I've tried playing around with parameters and return and googling and even some gnashing of teeth, but to no avail. I keep ending up with errors like this:

Traceback (most recent call last):
  File "<pyshell#525>", line 1, in <module>
    time()
  File "<pyshell#524>", line 4, in time
    number()
  File "<pyshell#522>", line 3, in number
    calc1 = number1 * week
NameError: name 'week' is not defined

I'm new to programming so I'm sure I'm missing something annoyingly simple, but I haven't been able to figure it out on my own and would appreciate any help.