Python for Beginners: The Ultimate Crash Course to Learn Python in One Week with Step-by-Step Guidance and Hands-On Exercises (Data Science Mastery Book 1) by Andrew Park

Author:Andrew Park [Park, Andrew]
Language: eng
Format: azw3, epub
Published: 2020-06-25T16:00:00+00:00

Program Code Resolution:

Line 10: Enter a year, but remember to call the int () function to convert it to an integer type.

Line 12-15: Judge whether it is a leap year.

Condition 1: every 4 leaps (divisible by 4) and every 100 leaps (not divisible by 100).

Condition 2: every 400 leaps (divisible by 400). One of the two conditions is a leap year. Readers are asked to inquire whether the following years are leap years: 1900 (flat year), 1996 (leap year), 2004 (leap year), 2017 (flat year), 2400 (leap year).

Multiple Choices

If there is more than one conditional judgment expression, elif conditional statement can be added. Elif is like the abbreviation of "else if." Although using multiple if conditional statements can solve the problem of executing different program blocks under various conditions, it is still not simple enough. Then, elif conditional statements can be used, and the readability of the program can be improved.

Note that if the statement is a logical "necessity" in our program. Elif and else do not necessarily follow, so there are three situations: if, if/else, if/elif/else.

The format is as follows:

If condition judgment

Expression 1:

# If the conditional judgment expression 1 holds, the program statement in this program block is executed

Elif condition judgment

Expression 2:

# If the conditional judgment expression 2 holds, execute the program statement in this program block

Else：

# If none of the above conditions hold, execute the program statement in this program block,

For example:

If first==second:

# If first equals second, execute the program statement in this program block

Elif first>second：

# If first is greater than second, execute the program statement in this program block

Else：

# if first is not equal to second and first is less than second, execute the program statement in this program block.

The following example program is used to practice the use of IF multiple selection. The purpose of the sample program is to detect the current time to decide which greeting to use.

[sample procedure: currentTime.py]

Detects the current time to decide which greeting

01 # -*- coding: utf-8 -*-

02 """

03 Program Name: Detect the current time to decide which greeting to use

04 Topic Requirements:

05 Judging from the current time (24-hour system)

06 5~10:59, output "good morning"

07 11~17:59, output "good afternoon"

08 18~4:59, output "good night"

09 """

11 import time

13 print ("current time: {}.” format (time.strftime ("%h:% m:% s"))

14 h = int( time.strftime("%H") )

16 if h>5 and h < 11:

17 print ("good morning!" )

18 elif h >= 11 and h<18:

19 print ("good afternoon!" )

20 else:

21 print ("good night!")

The execution results of the program will be shown on the screen.

The output shows the current time in the sample program to judge whether it is morning, afternoon, or evening, and then displays the appropriate greeting. Python's time module provides various functions related to time. The Time module is a module in Python's standard module library.

Before using it, you need to use the import instruction to import and then call the strftime function to format the time into the format we want. For example, the following program statement is used to obtain the current time.

import time

Time.strftime ("%h:% m:% s")

# 18: 36: 16 (6:36:16 p.

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