python全栈闯关--XX-细节总结汇总

1、The start value of slice is less than then end value,and the step is negative

print("if the start value less then the end value and the step is negative ! "
      "No error will be reported and empty will be returned, ")
for i in range(0, 10, -1):
    print(i)

2、One line of code exchanges the value of a and b

# One line of code exchanges value of a and b
a = 1
b = 2
a, b = b, a
print(a, b)