问题描述:

Question for you all. I'm coding an assignment for school in which I have to simulate a physical process of water flowing between three ponds, and how a pollutant dumped into pond 1 flows between the ponds. I keep getting the error "IndexError: list index out of range". I have tinkered around with different things all day but cannot get the error to go away.

Here is my code below: (fyi python says I have an error on line 49, 32, and 38).

`POND_1 = [0]`

POND_2 = [0]

POND_3 = [0]

# POND 1

def pond1(timeInput):

pollutants = Inflow3(timeInput-1)-Outflow2(timeInput-1)+POND_1[timeInput-1]

total = leakingInput*timeInput

if total <= maximumInput:

pollutants += leakingInput

return pollutants

def Inflow3(timeInput):

return 0.005*POND_3[timeInput]

def Outflow2(timeInput):

return 0.005*POND_1[timeInput]

#POND 2

def pond2(timeInput):

return Inflow1(timeInput-1)-Outflow3(timeInput-1)+POND_2[timeInput-1]

def Inflow1(timeInput):

return 0.005*POND_1[timeInput]

def Outflow3(timeInput):

return 0.005*POND_2[timeInput]

#POND 3

def pond3(timeInput):

return Inflow2(timeInput-1)-Outflow1(timeInput-1)+POND_3[timeInput-1]

def Inflow2(timeInput):

return 0.005*POND_2[timeInput]

def Outflow1(timeUnput):

return 0.005*POND_3[timeInput]

# User Input

maximumInput = int(input("Please enter the maximum amount of pollutant: "))

leakingInput = float(input("Please enter the rate in which the pollutant is leaking: "))

timeInput = int(input("Please enter the amount of time you would like the simulation to run in minutes: "))

# Amount of Pollutant in Pond every hour calculation

for n in range(0, timeInput+1):

POND_1.append(pond1(n))

POND_2.append(pond2(n))

POND_3.append(pond3(n))

if n % 60 == 0:

print("The amount of pollutant in Pond 1 is: ", POND_1[n])

print("The amount of pollutant in Pond 2 is: ", POND_2[n])

print("The amount of pollutant in Pond 3 is: ", POND_3[n])

if n == timeInput:

print("Final number of pollutants in Pond 1", POND_1[timeInput])

print("Final number of pollutants in Pond 2", POND_2[timeInput])

print("Final number of pollutants in Pond 3", POND_3[timeInput])

It's a typo:

```
def Outflow1(timeUnput):
```

has to be:

```
def Outflow1(timeInput):
```