python_basics.py

"""
This script will demonstrate some of the basic operations in 
python, like if statments, for loops, and functions.
"""

#%% 

# This is a comment.  Comments are not executed by the computer.

# This is a variable.  Variables are used to store information.
# Variables can be numbers, strings, lists, or other things.
# Variables can be changed.
x = 1


# %% create a basic function

def new_function():
    pass

#%% run the new function

new_function()
# %% function to print stuff

def func2(arg1):
    """
    This function accepts an argument and
    prints out that argument.
    """

    print("The argument is ", arg1)

#%% run func2
func2('Hello World')
func2()

# %%
def func3(arg1, arg2=True):
    if arg2:
        print('arg2 is True!')
    print('arg1 is', arg1)

#%% run func3
func3('test')
func3('test2', False)

# use named arguments
print('example with named args:')
func3(arg2=True, arg1=123)

# %% add numbers
def add_numbers(a, b):
    """
    This function adds two numbers together
    """

    result = a + b

    return result

#%% 
c = add_numbers(2, 123)


# %% test cases
assert add_numbers(2, 2) == 4
assert add_numbers(4, -1) == 3
assert add_numbers(3.2, 1.4) == 4.6


# %% lab preparation
my_list = ['Hello', 'BFOR', 206, None, 'Bye!']

# %% for loop over the list
for item in my_list:
    print(item)

# %% hint for today's lab
a=None

if a:
    print('a has a value:', a)
else:
    print('a is None')
# %% demonstrating numeric index for loop
for i in range(len(my_list)):
    print("the value of i is", i)
    print("the value of my_list at i is", my_list[i])
    


# %%