Im Trying To Transfer The Elements In The List To Another List. And Im Asking How Many Numbers Would Be Transferred To The List B But Error Is Showing

im trying to transfer element from list a to list b and im asking how many numbers would i like to transfer.It shows me this error: '<=' not supported between instances of 'Non

Solution 1:

b.append(i) returns None. therefore the comparison b.append(i) <= 2 raises an error. if you wanted to base your code on the length of the list you could use len(b). something like:

for i in a:
    if len(b) < transfer:
        b.append(i)
    else:
        break

alternatively you could do this:

b = a[:transfer]

this would just use the slice of the old list a as the new list b.

Solution 2:

1. First of all you should prevent error when you convert input to int. There are 2 ways how to do this.

   1. Try .. except statement.

      transfer = -1while transfer < 0:
          try:
              inp = input("how many numbers would you like to transfer:?")
              transfer = int(inp)
          except:
              print("Invalid input.")
      

   2. isdecimal().

      transfer = -1while transfer < 0:
          inp = input("how many numbers would you like to transfer:?")
          if inp.isdecimal():
              transfer = int(inp)
          else:
              print("Invalid input.")
      

2. Now about main task. There's 3 methods how to solve it.

   1. For loop using enumerate().

      for i, el in enumerate(a):
          if i < transfer:
              b.append(el)
          else:
              break
      

   2. List comprehension:

      b = [el for i, el in enumerate(a) if i < transfer]       
      

   3. List slicing:

      b = a[:transfer]