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print    ("Hi") #you can have spaces after print...didn't know that


    

    




Hi

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#raise SystemExit


    

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principal = 1000
rate = .05
numyears = 5
year = 1
print("year", "principal")
#I put this in a function since I don't want to change the values
#rather than working with global variables, fun uses local ones.
def fun(principal, rate, numyears, year):
    while year <= numyears:
        #principal = principal*(1+rate)
        #print(year, principal)
        principal*=1+rate#c++ style also works
        #3d integer right aligned in column of width 3
        #0.2f float with 2 digits after decimal point
        #print("%3d %0.2f" % (year, principal))
    
        #a more modern way uses the format() function
        #print(format(year,"3d"), format(principal,"0.2f"))

        #strings also have a format method.
        #{argument passed to format() method, format specifier}
        print("{0:3d} {1:0.2f}".format(year,principal))
        year += 1
fun(principal,rate,numyears,year)


    

    




year principal
  1 1050.00
  2 1102.50
  3 1157.62
  4 1215.51
  5 1276.28

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print(principal, rate, numyears, year)


    

    




1000 0.05 5 1

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#just want to see if python can do *= like c++
a = 1
for i in range(1,11):
    a *=2
    print(a)


    

    




2
4
8
16
32
64
128
256
512
1024

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#file input/output
#read from file
for line in open('foo.txt'):
    print(line, end = "")
    #added end argument to get rid of spaces after each line


    

    




Random expressions
Awesome if they had structure
Always wandering

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#output to file
f = open("out.txt", 'w'),#open file for writing
while year<= numyears:
    principal*=1+rate
    print("{0:3d} {1:0.2f}".format(year,principal),file = f)
    #f.write("%3d %0.2f\n" % (year, principal)) is equivalent
    year+=1


    

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#read user input
#import sys
#dir(sys)
#sys.stdout.write("Enter your name: ")
#name = sys.stdin.readline()#this doesn't work?
name = input("enter your name: ")


    

    




enter your name: kevin

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