"""
John Rachlin
DS 2000: Intro to Programming with Data


Date: Wed Sep 21 20:09:56 2022

File: io_is_slow.py
    
Description: 
    How fast can we add the numbers 1-million
    
    
"""


#%%  
# A cell is a block of code we can run in isolation
# Cells are not part of python.  Spyder provides this feature
# To start a new cell, use the special comment code: $%%
# There are options in the toolbar to:
#    - Run current cell and stay in that cell
#    - Run current cell and advance to next cell
#    - variables declared in a previously executed cell
#       are remembered in subsequence cells.
#  Cells are merely a TEACHING aid for DEMONSTRATING elements
#   of python.  Your code should STILL HAVE A MAIN()!

name = "John"
print("Hello", name)

#%%

minval = min(3,6,2,4,1,9)
maxval = max(5,6,3,4,2,1)
print(minval, maxval)


#%% WHILE loops

"""
while loops let us repeat a block of code
over and over WHILE some specified condition
is true.  If the condition becomes false, 
the while loop stops repeating.
"""

# Counting to 10

counter = 0
while counter < 10:
    counter = counter + 1
    print(counter)
    
print("Done")


#%%

# Counting to a million!

counter = 0
while counter < 1000000:
    counter = counter + 1
    print(counter)
    
print("Done")


#%% Timing our code

import time
current_time = time.time()
print("seconds: ", current_time) # seconds since Jan 1, 1970
print("years  : ", current_time / (3600 * 24 * 365.25))


#%% How fast can we count to a million?

# Counting to a million!


start = time.time()

counter = 0
while counter < 1000000:
    counter = counter + 1
    print(counter)
    
print("Done")

finish = time.time()

elapsed = finish - start
print("It took", elapsed, "seconds")


#%% Counting WITHOUT printing is much faster!

import time

start = time.time()

counter = 0
while counter < 1000000:
    counter = counter + 1

finish = time.time()

elapsed_np = finish - start
print("It took", elapsed_np, "seconds")

pct_counting = elapsed_np / elapsed * 100.0
pct_printing = (elapsed - elapsed_np) / elapsed * 100.0

print("% time printing:", round(pct_printing,2))
print("% time counting:", round(pct_counting,2))
print("% Total        :", round(pct_printing + pct_counting,2))