So, I made that code that simulates reproduction:

    try:
        def del1stOccof(string, inList):
            inList=list(inList)
            elInLst=1
            for lElt in inList:
                if lElt==string:
                    del inList[elInLst]
                    return inList
        import random as defi
        feedingPlacesNum=int(input("How many food pairs do you want? "))
        doveBlobNum=int(input("How many dove blobs do you want? "))
        hawkBlobNum=int(input("How many hawk blobs do you want? "))
        blobList=[]
        repeatsProgram=0
        for addingDoves in range(doveBlobNum):
            blobList.append("dove")
        for addingHawks in range(hawkBlobNum):
            blobList.append("hawk")
        for i in range(336):
            repeatsProgram=repeatsProgram+1
            defi.shuffle(blobList)
            deleteBlobList=[]
            print(f"The number of dove blobs is: {blobList.count("dove")}")
            print(f"The number of hawk blobs is: {blobList.count("hawk")}")
            fPList=[]
            for addingPlacesToFeedingPlacesList in range(feedingPlacesNum*2):
                fPList.append("empty")
            elementInBlobList=0
            for element in blobList:
                isBlobNotIn=fPList.count("empty")>0 #We count the number of empty feeding places, and if it's bigger than 0, we allow the blob to enter.
                if not isBlobNotIn:
                    deleteBlobList.append(elementInBlobList)
                while isBlobNotIn:
                    sendBlobTo=2*defi.randint(0,99)
                    if fPList[sendBlobTo]=="empty":
                        fPList[sendBlobTo]=element
                        isBlobNotIn=False
                    elif fPList[sendBlobTo+1]=="empty":
                        fPList[sendBlobTo+1]=element
                        isBlobNotIn=False
                elementInBlobList=elementInBlobList+1
            for cFPlList in range(int(len(fPList)/2)):
                if fPList[cFPlList*2]=="dove" and fPList[cFPlList*2+1]=="dove":
                    pass
                elif fPList[cFPlList*2]=="empty" and fPList[cFPlList*2+1]=="empty":
                    pass
                elif fPList[cFPlList*2]=="dove" and fPList[cFPlList*2+1]=="empty" or fPList[cFPlList*2]=="empty" and fPList[cFPlList*2+1]=="dove":
                    blobList.append("dove")
                elif fPList[cFPlList*2]=="empty" and fPList[cFPlList*2+1]=="hawk" or fPList[cFPlList*2+1]=="empty" and fPList[cFPlList*2]=="hawk":
                    blobList.append("hawk")
                elif fPList[cFPlList*2]=="hawk" and fPList[cFPlList*2+1]=="hawk":
                    deleteBlobList.append("hawk")
                    deleteBlobList.append("hawk")
                elif fPList[cFPlList*2]=="hawk" and fPList[cFPlList*2+1]=="dove" or fPList[cFPlList*2]=="dove" and fPList[cFPlList*2+1]=="hawk":
                    if defi.randint(0,1)==0:
                        deleteBlobList.append("dove")
                    if defi.randint(0,1)==1:
                        blobList.append("hawk")
            print(f"This is the {repeatsProgram}. generation.")
            for deletingUnfedBlobs in deleteBlobList:
                blobList=del1stOccof(deletingUnfedBlobs,blobList)
    except KeyboardInterrupt:
        print("Interrupt: You interrupted the program via Ctrl+C.")```
and it gives the error:

Traceback (most recent call last):
File “c:UsersMarjanaDesktopPythonblobSim.py”, line 62, in
blobList=del1stOccof(deletingUnfedBlobs,blobList)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “c:UsersMarjanaDesktopPythonblobSim.py”, line 4, in del1stOccof
inList=list(inList)
^^^^^^^^^^^^
TypeError: ‘NoneType’ object is not iterable

anyone know what to do?


I actually didn't do anything because I didn't know what's happening.