Separating element type with list from input-CodePudding

Trying to separate int, string, float from the list and put them in their variable. It's easy to do with predefined list. I am trying to do with input list.

NumList  = input("Enter string, int, float with the list : ")
#NumList = [1, 4.9, 4, "Five", 6, 7, "Eight", "#" ,2, 15, "$", "."]
StrList = []
IntList = []
FloatList = []
for i in NumList:
  typobj = type(i)
  if typobj == str:
    StrList.append(i)
  elif typobj == float:
    FloatList.append(i)
  elif typobj == int:
    IntList.append(i)
print(f"StrList = {StrList}")
print(f"IntList = {IntList}")
print(f"FloatList = {FloatList}")

When "#", ".", etc..are included, all of them went to string. They should be in string.

Enter string, int, float with the list : [1, 4.9, 4, "Five", 6, 7, "Eight", "#" ,2, 15, "$", "."]
StrList = ['[', '1', ',', ' ', '4', '.', '9', ',', ' ', '4', ',', ' ', '"', 'F', 'i', 'v', 'e', '"', ',', ' ', '6', ',', ' ', '7', ',', ' ', '"', 'E', 'i', 'g', 'h', 't', '"', ',', ' ', '"', '#', '"', ' ', ',', '2', ',', ' ', '1', '5', ',', ' ', '"', '$', '"', ',', ' ', '"', '.', '"', ']']
IntList = []
FloatList = []

CodePudding user response：

All input from

x = input("Enter input: ")

is taken as a string unless otherwise specified. if you are wanting extract strings integers and floats from the list shown above you should use.

parsed_list = [i.strip("'") for i in input_list.split(",")]
for i in parsed_list:
    try:
        int_list.append(int(i))
    except ValueError:
        try:
            float_list.append(float(i))
        except:
            str_list.append(i)

as a note variables in python should be written in snake case. Classes and objects are usually denoted by camel case so you will make it a lot easier for your maintenance programmer by following the convention (barring any company policy to the country)

CodePudding user response：

Use ast.literal_eval to making list from str input

from ast import literal_eval

NumList = literal_eval(NumList)

Use list comprehension for separating

StrList = [i for i in NumList if type(i) == str]
IntList = [i for i in NumList if type(i) == int]
FloatList = [i for i in NumList if type(i) == float]

But better to change interaction instead of literal_eval:

# creating an empty list
lst = []
  
# number of elements as input
n = int(input("Enter string, int, float : "))
  
# iterating till the range
for i in range(0, n):
    ele = int(input())
  
    lst.append(ele) # adding the element
      
print(lst)

CodePudding user response：

This is because input() reads everything in as string objects. You need to try casting the user input to float or int. If it works, it is a valid int, otherwise it will raise an ValueError and you have to try another data type. See here: Convert any user input to int in Python

CodePudding user response：

You can define another function or simply use a loop to remove unwanted characters from your string list.

str_list = ['[', '1', ',', ' ', '4', '.', '9', ',', ' ', '4', ',', ' ', '"', 'F', 'i', 'v', 'e', '"', ',', ' ', '6', ',', ' ', '7', ',', ' ', '"', 'E', 'i', 'g', 'h', 't', '"', ',', ' ', '"', '#', '"', ' ', ',', '2', ',', ' ', '1', '5', ',', ' ', '"', '$', '"', ',', ' ', '"', '.', '"', ']']

# Define unwated character's list:
not_wanted_char_list = [',', '"', '[', ']'] # etc...

# Initialize for-loop:
for not_wanted_char in not_wanted_char_list
    str_list.remove(not_wanted_char)

And After you do that, you can then create another for-loop which joins the letters to form words (eg. 'Five' and 'Eight'), until it reaches either a capital letter or a number, which will mark the end of your word.