Python notes (i)-do not misuse ++i 、--I

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++i can also be written in Python, but the meaning is completely different from C + +. Python's ++i is not to increment I by 1, but rather to put 2 plus sign in front of I, so I will not change the value.

1 i = 02 while I < 5:3     print(++i)

So the above loop will be a dead loop that has been printing 0.

Similarly, the meaning of-I is not self minus 1, but two negative minus positive.

1 i = 52 while I > 0:3     print(-I.)

This is also a dead loop that has been printing 5.

i++, i--is a syntax error in Python, because a plus or minus sign is followed by a number or an shaping variable.

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Python notes (i)-do not misuse ++i 、--I