Python代码报SyntaxError: invalid syntax错误，请求修复（第3行报错）

运行以下Python代码时，始终提示第3行出现SyntaxError: invalid syntax语法错误，修复方案如下：

原始代码 #

nterms = int(input("How many terms? ")

n1, n2 = 0, 1
count = 0,


if nterms <= 0:
   print("Please enter a positive integer")

elif nterms == 1:
  print("sequence upto",nterms,":")
   print(n1)

else
   print("sequence:")
   while count < nterms
       print(n1)
       nth = n1 + n2
       
       n1 = n2
       n2 = nth
       count += 1

存在的语法错误 #

• 第1行input()函数缺少闭合括号
• 第3行count = 0后多了逗号
• elif代码块内的print语句缩进不一致
• else语句后缺少冒号
• while循环语句后缺少冒号

修复后的代码 #

nterms = int(input("How many terms? "))

n1, n2 = 0, 1
count = 0

if nterms <= 0:
    print("Please enter a positive integer")

elif nterms == 1:
    print("sequence upto", nterms, ":")
    print(n1)

else:
    print("sequence:")
    while count < nterms:
        print(n1)
        nth = n1 + n2
        
        n1 = n2
        n2 = nth
        count += 1

内容的提问来源于stack exchange，提问作者Arifah Ayuniyyah