Program that uses input (). split ("") and does not run in Python 3.5.1

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Program that uses input (). split ("") and does not run in Python 3.5.1

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#1 by (4 votes)
#2 by (-1 votes)

3

I have to do several exercises in Python that the input values should be on the same line and indicated the input().split(" ") , but the program does not run, it gives error. Ex.:

C, Q = input().split(" ")
C = int(C)
Q = int(Q)

if(C==1):
    T=4.00
elif(C==2):
    T=4.50
elif(C==3):
    T=5.00
elif(C==4):
    T=2.00
elif(C==5):
     T=1.50
print("Total: R$ %.2f"%(T*Q))
print

The error q gives:

Traceback (most recent call last):
    File "C: /Users/ILDA/Desktop/lanche.py", line 1, in
      C, Q = input (). Split ("")
  ValueError: not enough values to unpack (expected 2, got 1)

python

asked by anonymous 21.09.2016 / 05:59

2 answers

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score 4 · Answer 1

This is happening because you are trying to make a unpacking of a list (in the code C, Q = input().split(' ') ) however, in your unpacking you are expecting 2 values or more ("C, Q"), but I believe you should is only passing a word in the command line (example "foo"), so it will raise this exception. Here's how unpacking works:

>>> x, y = [1, 2]

>>> x, y
(1, 2)

>>> x, y = [1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: need more than 1 value to unpack
need more than 1 value to unpack

The relation with the number of words is because the code split(" ") will return a list of strings from a given string, eg:

>>> "foo bar".split(" ")
['foo', 'bar']

>>> "foo".split(" ")
['foo']

In short, the code works but is unsure of how it was done.

score -1 · Answer 2

Here are four ways I know so you can put a value next to each other:

C, Q = input('Digite algo: ')
lista = [C, Q]

Q = int(Q)
C = int(C)
#Primeira forma - Utilizando a vírgula, bem simples.

print(C,Q,'- primeira forma\n')
#Segunda forma - Transformando as variáveis em str e usando o + para unir, simples também.

print(str(C)+str(Q),'- segunda forma\n')
#Terceira forma - Tirando a quebra de linha do print(), é algo bem legal também e as vezes útil.

print(C,end='')
print(Q,'- terceira forma\n')
#Quarta forma - Pegando os valores de uma lista e unindo(transformando em str, ou int no caso.)

print(''.join(lista),'- quarta forma\n')

if(C==1):
    T=4.00
elif(C==2):
    T=4.50
elif(C==3):
    T=5.00
elif(C==4):
    T=2.00
elif(C==5):
    T=1.50
print("Total: R$ %.2f"%(T*Q))

I hope I have helped. And as I said, the split serves to turn a string into a list, similar to the .join I used above.