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Fernando Javier León
Asked: 2022-07-06 17:44:35 +0800 CST 2022-07-06 17:44:35 +0800 CST

How to remove dictionaries with 0 values ​​from a list? python

  • 772

I have a list like this:

bloqueOrdenApi = [{'Articulos': 0}, {'Libros': 0}, {'Proyectos': 5}, {'GradoAcademico': 7}, {'Capacitacion': 8}]

I am trying to remove the dictionaries whose value is 0, in this case Articles and Books, I am doing this:

for b in bloqueOrdenApi:
  for k, v in b.items():
    if v == 0:
      del bloqueOrdenApi[v]
print(bloqueOrdenApi)

But I get as output this:

bloqueOrdenApi = [{'Libros': 0}, {'Proyectos': 5}, {'GradoAcademico': 7}, {'Capacitacion': 8}]

Only the Articles element is deleted and Books are not. How can I remove all dictionaries that have a value of 0? I hope you can help me. Thanks in advance.

python

2 Answers

  1. Best Answer

    I don't recommend using delto remove items from a list, instead use the method pop(), as delit is used for other things.

    Your mistake is that you always eliminate the first element, by doing so del bloqueOrdenApi[v]you are eliminating from the list bloqueOrdenApithe element vthat will ifalways be valid for you 0. Another thing is that when the element is eliminated, the next one will be omitted, this is because, for example, if the element 0is eliminated, the next one is the element 1and the one that now occupies the position 1is the one that was previously the second.

    I think one way to avoid confusion is by using a list comprehension.

    bloqueOrdenApi = [e for e in bloqueOrdenApi if list(e.values()) != [0]]
print(bloqueOrdenApi)

    Here we only get the values ​​and since the result is a dict_values()we will convert it to a list with list()and this time we compare with[0]

    • 2

  2. Exactly, Christian's answer is absolutely right, I created a function that, in order not to eliminate the first index, I made a repetition according to the length of the list:

    def arreglo(lista):
  for j in range(0,len(lista)):
    for b in lista:
      for k, v in b.items():
        if v == 0:  del lista[v]
  return lista

    But undoubtedly the Christian code is what reflects the simplicity of python. Very good Christian. Greetings to all

    • 2