[已解决]各位大神，教教我吧

傻眼貓咪

1. x = int(input())
   
2. sum = 0
   
3. for n, i in enumerate(range(1, x*2, 2)):
   
4.     sum = sum - (1 / i) if n&1 else sum + (1 / i)
   
5. print(round(sum, 2))

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