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Alejandro Carrera
Asked: 2020-09-29 14:49:46 +0800 CST 2020-09-29 14:49:46 +0800 CST

Convert a list of quoted numbers to floats in Python

  • 772

A little algorithm that converts numbers to a character string and then adds it is:

total= 0

cadena= "1.2,1.5,1.7"

for i in cadena.split(","):
    i= float(i)
    total+= i
print(total)

Now, suppose that the numbers come individually in quotes like this:

cadena= "1.2","1.5","1.7"

What is the command that I must use so that each number remains as a float and then add it using the same for? Using the initial code for the last string I get the following error:

AttributeError: 'tuple' object has no attribute 'split'

Any guidance will be greatly appreciated.

python

2 Answers

  1. Best Answer

    cadena = "1.2","1.5","1.7"is a tuple actually, it is equivalent to cadena = ("1.2","1.5","1.7"). Simply loop through it with a forand do the casting:

    cadena= "1.2","1.5","1.7"

for i in cadena:
    print(float(i))

    If you want a tuple of floats use a compression generator:

    >>> cadena_f = tuple(float(i) for i in cadena)
>>> cadena_f
(1.2, 1.5, 1.7)
    • 5

  2. Here are two approaches to achieve the same thing:

    # string o cadena
cadena= "1.2,1.5,1.7"
tuple(map(float,cadena.split(",")))

# tupla de strings
tupla= ("1.2","1.5","1.7")
tuple(map(float,tupla))

    whose result is:

    Out[0]:(1.2,1.5,1.7)
    • 1