Multiple if statements are judged individually each time
a = 5 If a < 6: # condition 1 print(1) If a < 7: # condition 2 print(2) else: print(3)
Condition 1 and condition 2 are independent. The value of a in the first judgment is less than 6, so the number 1 is printed. The value of a in the second judgment is less than 7, so 2 is printed. If all if statements fail, the statement after else will be executed. Otherwise, else statements will not be executed.
If condition 2 is changed to elif, the result is different
#Python learning exchange group: 778463939 a = 5 If a < 6: # condition 1 print(1) Elif a < 7: # condition 2 print(2) else: print(3)
This time, condition 1 and condition 2 are related, that is, if condition 1 is judged successfully, condition 2 will not continue to judge. Conversely, if condition 1 fails, condition 2 will continue to be judged If both condition 1 and condition 2 fail, execute the statements in else.
The result of example 2 is obviously that only 1 will be printed.
Of course, it’s OK to mix if and elif, but it looks strange and has poor readability
a = 5 if a < 6: print(1) elif a < 4: print(2) if a < 7: print(3) else: print(4)
The results are: 1, 3
If you only want to execute one block of code, use the if elif else structure;
If you want to run multiple code blocks, use multiple if. (multiple conditions are met at the same time)