#!/usr/bin/env python
# coding: utf-8

# In[5]:


# Section 4.4 -- calculating a running total
# Example program -- sum 5 numbers from a user
# set the max summands
MAX=5
#define my accumulator variable
total=0.0
for counter in range(MAX):
    numbertoadd=float(input("What is your next number?"))
    total=total+numbertoadd
print("The sum of the numbers is",total)


# In[6]:


# Another option for updating variables
# so-called augmented assignment operators
# Operator       Equivalent to            Result using x=6
# +=             x=x+3 --- x+=3           x==9
# -=             x=x-2 --- x-=2           x==4
# *=             x=x*2 --- x*=2           x==12
# /=             x=x/2 --- x/=2           x==3
# %=             x=x%4 --- x%=4           x==2
#


# In[11]:


# Section 4.5 - sententials
# Definition: A sentential is a special symbol that marks
#             the end of a sequence of values.
#
# Situation: use this when you're writing code and you don't
#            know how many times to loop
#
# Options for the situation:
# 1. ask user if they want another value (downside: could be cumbersome)
# 2. ask user how many loops to do at beginning (downside: painful for user)
# 3. use a senential!
#
# Height of patients - program will calculate the average
# weight of patients given to the computer. We will write
# a prompt "Enter weight or 0 if done."
# 0 is a good value because: no one weights 0 pounds
#
# Average of n items: (sum of the n items)/n
#
# we will need two accumulators: one for the total weight
# inputted by the user and one for how many weights are
# included
# define accumulators
# count variable
count=0 #for the denominator of the average
sum_of_weights=0.0
new_weight=float(input("Enter the weight or 0 to stop."))
while(new_weight != 0):
    sum_of_weights+=new_weight
    count+=1
    new_weight=float(input("Enter the weight or 0 to stop."))
if(count!=0):
    print("The average weight is",sum_of_weights/count)


# In[ ]:


# Annual tax on property 
# Goal -- write program that calculates the tax on a list of properties received that day
# Each property in the county is assigned a lot number.
# Turns out: in an interview with client, you discover that lot numbers start at 1
# magic number
TAX_FACTOR=0.0065
lot_num=int(input("What lot number? Enter 0 if done."))
print("Lot Number\t Tax")
while lot_num!=0:
    value_of_property=float(input("What is the value of lot?"))
    tax=value_of_property*TAX_FACTOR
    print(lot_num,"\t","$",tax,sep='')
    lot_num=int(input("What lot number? Enter 0 if done."))
# unexpectedly: the program doesn't make a nice list in the
# end because it keeps asking for new info which screws up
# the list -- we COULD get around this by making a list of
# the data collected -- but we don't technically know how yet
# -- we will see later


# In[29]:


# Formatting floats to 2 decimal places
var=1232132131.234534324324
#var="abcd"
print(var)
print(format(var,',.2f'),format(var,'.5f'))
print(var)