python 显示invalid syntax

Question

```import time

start_time = time.time()

x = open('assignment_1.5_Q1_input.txt', 'r')
n = int(x.read())
x.close()

ar = ""
num = 0
for i in range(1,n+1):
ar += str(i)
num += int(ar)

fp=open('assignment_1.5_Q1_output.txt','w')
fp.write(str(num)
fp.close()

end_time = time.time()
print(end_time - start_time)

也没有空格啥的呀 为啥呀

Answer 1

fp.write(str(num))
这里少了最后一个括号。

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