CODEWITHSUNDEEP
pythonpython-3.x
Muavia
Muavia

Reputation: 408

how to remove "TypeError: can't multiply sequence by non-int of type 'float' "?

I am a python learner. I'm trying to find a retirement funds simulator that takes three arguments: a salary (salary), a percentage of your salary to save (save), and a list of annual growth percentages on investments (growthRates). The length of the last argument defines the number of years you plan to work; growthRates[0] is the growth rate of the first year, growthRates[1] is the growth rate of the second year, etc. on running program I'm having this error:

    TypeError: can't multiply sequence by non-int of type 'float'

The code I've written is:

    def ret_fund():
        a = int(input("Enter Salary: "))
        b = int(input("Enter Saving Percentage: "))
        c = list(input("Enter List of Growth Rates per Year (must be zero for first year): "))
        ans_list=[]
        x = 1
        global x
        for i in c:
            float(i)
            x = x*(1+0.01*i)+(a*b*0.01)
            ans_list.append(x)
        print (ans_list)

I just can't figure out the error. Help me with that please. what about variable c? it doesn't actually take a list as an input as demanded by the program. I have to enter numbers like 05643 and they get picked one by one. what if I want to give input like [0, 5, 6, 4, 3]?

Upvotes: 2

Views: 1110

Answers (2)

Mark Ransom
Mark Ransom

Reputation: 308402

The problem is with the global x, which overrides the local assignment of x. I'm assuming the global x is a list of some kind.

Edit: A previous version of this answer contained incorrect code for reading the growth rates.

To read a list of growth rates you should read it as a single string, split the string, and convert each piece. The input method doesn't do the right thing on its own.

c = raw_input("Enter List of Growth Rates per Year (must be zero for first year): ")
for i in c.split():
    i=float(i)

Upvotes: 2

hochl
hochl

Reputation: 12950

The statement float(i) does nothing. Either use i=float(i), or substitute i in your formula with float(i), since it appears only once.

Depending on what the user enters, input() will return a corresponding object. If you enter 0.0, 1.0, 2e10, 99 you already get a tuple of float and integer values, so there is no reason to convert anything, because, for example, 0.01*x will be converted to floating point in any case. Example:

>>> a=input("enter numbers: ")
enter numbers: 1,2,3.0, 5e-10,   99
>>> print type(a), repr(a)
<type 'tuple'> (1, 2, 3.0, 5e-10, 99)
>>> for i in a: print i, type(i)
... 
1 <type 'int'>
2 <type 'int'>
3.0 <type 'float'>
5e-10 <type 'float'>
99 <type 'int'>
>>> for i in a: print 0.01*i, type(0.01*i)
... 
0.01 <type 'float'>
0.02 <type 'float'>
0.03 <type 'float'>
5e-12 <type 'float'>
0.99 <type 'float'>

Upvotes: 2

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