06_function_test.py

# Demonstrates a simple function calling another
def interface():
    print('Welcome')
    # Demonstrates two ways to give functions argument values. First by
    # position order, second by using the keyword.
    passwordfunc('a', tryagain='Opps')

# Demonstrates use of default values.


def passwordfunc(password, retries=1, tryagain='Please try again',
                 fail='No more tries left'):
    while retries > 0:
        userinput = input('Please enter the password')
        if userinput == password:
            print('Correct!')
            break
        else:
            retries -= 1
            if retries > 0:
                print(tryagain)
            else:
                print(fail)


# Comment out if not using hydrogen.
interface()

# Demonstrates how using mutable objects as arguments can be used to build
# a function with a mutable result.
# This also works in classes by defining a class property as a mutable object.
# Any class instance that modifies said object does so for all instances of
# the class.


def mutablefunc(a, L=[]):
    L.append(a)
    # It is possible to return multiple values in python, but not
    # javascript.
    return L


print(mutablefunc(1))
print(mutablefunc(2))


# Demonstrates passing a function to a function.
def greet(name):
    print('hello ' + name)


def wrapper(func, arg):
    return func(arg)


wrapper(greet, 'Ash')