有几件小事。所以你从几个地方调用了不同的函数。因此，我删除了一些调用，并将ReturnValue从Terms（）中放入变量，然后它就工作了。

# first two terms
n1, n2 = 0, 1
count = 0

# Asks amount of terms to be generated 
def Terms():
   while True:
        nterms = (input("How many terms? "))
        if nterms.isdigit():
            nterms= int(nterms)
            if nterms > 0:
               break
            else:
               print("0")
        else:
            print("Please choose an number that is able to be used")
   return nterms

# Calls Terms then generates
def Fibonacci():
   # first two terms
   n1, n2 = 0, 1
   count = 0
   terms = Terms() # This is the new variable
   print("Fibonacci sequence:")
   while count < terms: # And using the variable here
      print(n1)
      nth = n1 + n2
     # update values
      n1 = n2
      n2 = nth
      count += 1
Fibonacci()

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解决办法可能是

while count < Terms():

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错误消息明确地告诉您，您不能与函数进行比较（而是与函数结果进行比较）。（但是在这个修复之后，你会遇到另一个问题...）
替代实施方式：

# Query the number of terms
while True:
    try:
        n = int(input("How many terms [integer > 1] ? "))
        if n > 1:
            break
    except:
        pass
    print("Invalid input, try again")

# Output the desired number of terms
f0, f1= 0, 1
for i in range(n):
    print("F"+str(i)+" =", f0)
    f0, f1= f1, f0+f1

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