python - Python中While循环后的缩进错误

Question

我有以下功能，Indentation Error每当我尝试运行它时都会收到一个：

def fib(n):    
    # write Fibonacci series up to n
    """Print a Fibonacci series up to n."""
a, b = 0, 1
while a < n:
print a
a, b = b, a+b
 # Now call the function we just defined:
fib(2000)

错误信息：

print a
        ^
IndentationError: expected an indented block

如何解决 python 中的 IndentationError 错误？

Answer 1

您需要正确缩进您的代码。就像其他语言使用括号一样，Python 使用缩进：

def fib(n):    
    # write Fibonacci series up to n
    """Print a Fibonacci series up to n."""
    a, b = 0, 1

    while a < n:
        print a
        a, b = b, a+b

Answer 2

要解决此问题，您需要添加空格。您的代码必须是这样的：

def fib(n):    
# write Fibonacci series up to n
"""Print a Fibonacci series up to n."""
      a, b = 0, 1

      while a < n:

            print a

            a, b = b, a+b

 # Now call the function we just defined:
fib(2000)

Answer 3

这只是因为语法。在 while 循环之后进入新行并给出 Tab 并开始编写如下语句。

>>> while a < 10:    *#this is your condition end with colon ':'*                             
...     print(a)      *#once come to new line press Tab button it will resolve problem*  

Answer 4

def fib(n):    
a, b = 0, 1
while a < n:
    print (a, end=' ')
    a, b = b, a+b
    print()
    fib(1000)