How to load lines from a file into variables that can be either strings, floats, or ints?

You're getting an index out of bounds because readline() only reads the one line. You should use readlines() to get an array of all the lines in your text file.

File:

duck
1
c
1.2

Code:

f = open("duck.txt")
enter = f.readlines() # Changed from readline to readlines
y = enter[0].replace("n", "") # .replace replaces all newlines ("n") with empty strings
hp = enter[1].replace("n", "")
coins = enter[2].replace("n", "")
status = enter[3].replace("n", "")
print(enter)
print(y)
print(int(hp)) # cast str to int
print(coins)
print(float(status)) # cast str to float

Output:

['duckn', '1n', 'cn', '1.2']
duck
1 # int
c
1.2 # float

Let's say you have the following txt-file:

1
word
2.5

The first issue you face is that the default type of the value from the text file is going to be string. Therefore, a classification of the content of the file would help you. The following piece of code will achieve this:

f = open('1.txt', 'r')
val_int = []
val_float = []
val_str = []
for i, line in enumerate(f):
    try:
        val = float(line)
        if val.is_integer():
            val_int.append((i,int(val)))
        else:
            val_float.append((i,val))
    except:
        val_str.append((i,line.replace('n','')))
f.close()
print(val_int) # OUTCOME: [(0, 1)]
print(val_float) # OUTCOME: [(2, 2.5)]
print(val_str) # OUTCOME: [(1,'word')]

The tuple to maintain the index of the line for future use.