Day-1python base loop for, while, judging if

1.if condition judgment

a=4if a==3:    print(‘正确，a的值为3‘)else:    print(‘错误！‘)>>:错误

2.for Cycle

for i in range(4):#range(3) range(start, stop[, step]) 如:range(4,7,2) 输出4,6    print(i)>>:0123

3.while Cycle

i=1while i<5:    print(i)    i += 1;

4.break jump out of the loop

i=1while i<5:    print(i)    i += 1;    if i==3:        break>>:12

5.continue continue the next cycle

while i<5:    i += 1;    if i==3:        continue    print(i)>>:245

Day-1python base loop for, while, judging if