Briefly summarize the characteristics of Python if multi-condition judgment statements

The reason why computers can do many automated tasks is that they can do conditional judgment by themselves. Just like the if else learned in junior high school, if XXXXX, then XXXXX, otherwise XXXXX, then XXXXX, this is the if elseconditional judgment statement that this chapter is mainly about.

For example, enter the user's age and print different content according to the age. In the Python program, use the if statement to implement:

age = 20
if age >= 18:
      print('your age is', age)
      print('adult')

According to the indentation rules of Python, if The if statement is judged to be True, and the two indented lines of the print statement are executed. Otherwise, nothing is done.

You can also add an else statement to if, which means that if if is judged to be False, do not execute the content of the if, but execute the else. ：

age = 3
if age >= 18:    
    print('your age is', age)  
   print('adult')
else:    
    print('your age is', age)
    print('teenager')

Be careful not to miss the colon :.

Of course the above judgment is very rough, you can use elif to make a more detailed judgment:

age = 3
if age >= 18:
    print('adult')
elif age >= 6:
    print('teenager'）
else:
    print('kid')

elif is the abbreviation of else if , there can be multiple elif, so the complete form of the if statement is:

if <条件判断1>:  
   <执行1>
elif <条件判断2>:
    <执行2>
elif <条件判断3>:
    <执行3>
else:
    <执行4>

ifThe execution of the statement has a characteristic, it is Judging from top to bottom, if a certain judgment is True, after executing the statement corresponding to the judgment, the remaining elif and else will be ignored. Therefore, please test and explain why the following program prints teenager:

age = 20
if age >= 6:
    print('teenager')
elif age >= 18:
    print('adult')
else:
    print('kid')

if judgment condition can also be abbreviated, for example:

if x:   
  print('True')

As long as x is a non-zero value, a non-empty string, a non-empty list, etc., it will be judged as True. False otherwise.

The above is the detailed content of Briefly summarize the characteristics of Python if multi-condition judgment statements. For more information, please follow other related articles on the PHP Chinese website!