不明白错误消息：for 语句中的语法无效

Question

我正在编写一个非常简单的程序，使用 for 循环输出 0-10 的数字。但是，当我单击运行时出现语法错误，以红色突出显示第 8 行中的“=”。我不明白为什么它是错误的？我在空闲模式下使用 python 3.5.2。

def numbers():
    print ("This program will count to ten, just you wait...")
    import time
    time.sleep(1)
    print ("\n\nLiterally wait I just need to remember base 10 because I 
    only work in binary!")
    time.sleep(4)
    int(counter) = 0
    for counter <**=** 9: 
    print ("\n" + counter)
    counter =  counter + 1

    print ("\n\nAnd there you go. Told you I could do it. Goodbye :) ")
    time.sleep(2)
    exit()

numbers()

Answer 1

for 的语法错误。根据 docs:

The for statement is used to iterate over the elements of a sequence (such as a string, tuple or list) or other iterable object.

这不是你的情况，或者你可以使用 range() 创建序列：

for i in range(1, 10):

然而这是人为的解决方法，虽然它会起作用，但并不是您真正应该做的。

您应该改用 while。 Docs 说：

The while statement is used for repeated execution as long as an expression is true

while counter <= 9:

Answer 2

这样试试：

def numbers():
    print ("This program will count to ten, just you wait...")
    import time
    time.sleep(1)
    print ("\n\nLiterally wait I just need to remember base 10 because I only work in binary!")
    time.sleep(4)
    for i in range(1, 10): #11 if you want 10 to be printed
        print i

    print ("\n\nAnd there you go. Told you I could do it. Goodbye :) ")
    time.sleep(2)

Answer 3

几点。节选：

int(counter) = 0
for counter <**=** 9: 
print ("\n" + counter)
counter =  counter + 1

有多个错误。

int(counter) = 0 是无效的 python 语法。
for counter <**=** 9 不是有效的 for 语句。
行 print ("\n" + counter) 和 counter = counter + 1 缺少正确的缩进。

将这四行替换为

for counter in range(10):
    print(counter)

不明白错误消息：for 语句中的语法无效

Don't understand the error message : Invalid syntax in for statement

python

for-loop

numbers

equals

syntax-error