[Python] Iterating through dict and list2d, list_value gets replaced with a str

I am iterating through a dict and after that through a 2d list[list[float|int] then i am changing the values of the list2d to the corresponding in the dict randomly a str appears

from the test i did it changes based on the size of the list2d example:

50, 50 = 13, 49

80, 80 = 15, 48


terrain_probability_dict: {float | int, str} = {-1: "e", 0.2 : "o", 0.5 : "M", 1 : "#"}
def generate_terrain(world: list[list[float | int]]):

keys = sorted(terrain_probability_dict.keys())
for i in range(1, len(keys)):
for y in range(len(world)):
for x in range(len(world[0])):
if keys[i - 1] < world[y][x] <= keys:
world[y][x] = terrain_probability_dict[keys]


how i checked it:


for y in range(len(world)):
for x in range(len(world[0])):
# Print only if the type of the current value is string

if isinstance(world[y][x], str):
print(f"Initial value at world[{y}][{x}]: {world[y][x]} (Type: {type(world[y][x])})")
#and
print(y, x)


Before the iteration and also the if isinstance code in the iteration From the prints i got that there is a "M" or "o" in the list when iterating

Why does a index in world change to int in the world

the error after about 15*50 iteration(depending on the list size):

if keys[i - 1] < current_value <= keys:​

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'float' and 'str'

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