CODEWITHSUNDEEP
pythonfilepython-3.xfile-handlingfilehandle
PokeBros
PokeBros

Reputation: 49

Add numbers and strings in python

This may seem like a duplicate but the other ones don't apply. So I am trying to make a piggy bank but I cannot figure out how to add a new line while I am using numbers. Right now I am using strings because it is the only way to add a new line. However, when I add the two numbers, it adds them like string. For example, if you entered 5.93 twice. It would print "5.935.93". So, I have to convert it to a string but then I won't be able to add a new line. Here is my code:

def piggybank():
    file = open('piggybank.txt','r+')
    money = input('How much money are you adding?')
    file.write(money + '\n')
    for line in file:
        money += line
    print("You now have:\n", money)
    file.close()

In the third line I could make money a float but then in the fourth line I wouldn't be able to add a new line. Can somebody help?

Upvotes: 0

Views: 1199

Answers (4)

UnsignedByte
UnsignedByte

Reputation: 897

You could keep money as an Integer, but when writing, use %s. Also, if you want to write to a file, you need to make a new variable set to open('piggybank.txt', 'wb') to write to the file.:

def piggybank():
    filew = open('piggybank.txt','wb')
    file = open('piggybank.txt','rb')
    money = input('How much money are you adding?')
    filew.write('%s\n' % money)
    for line in file:
        money += line
    print("You now have:\n%s" % money)
    filew.close()
    file.close()

Upvotes: 3

stonemask
stonemask

Reputation: 3

  • Addtion could be done between numeric objects.You need to notice that input() will give you a str(string) type object. And you need to convert str to float using float().

  • By trail and error,I've found following solition.Refernece doc links are strip() doc, open() doc. 

    def piggybank():
file = open('piggybank.txt','a') #open file for appending to the end of it.
money = input('How much money are you adding? ')
file.write(money + '\n') # Write strings to text file.
file.close()
file = open('piggybank.txt','r')
sum = float(0) # initialize sum with zero value.
for line in file:
    sum += float(line.strip('\n')) # srtip '\n' and convert line from str to float.
print("You now have: %s" % sum)
file.close()

Upvotes: 0

spicypumpkin
spicypumpkin

Reputation: 1219

You can convert to floats when your doing the math.

float(money) += float(line)

Upvotes: 0

Jarvis
Jarvis

Reputation: 8564

You can do this :

def piggybank():
    file = open('piggybank.txt','rb')
    money = input('How much money are you adding?')
    file.write(str(money) + "\n")
    for line in file:
        money += float(line.strip())
    print("You now have:\n" + str(money))
    file.close()

Upvotes: 0

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