Python practice Convert the input year to the Japanese calendar

Purpose

Created as a Python exercise. Converts the Western calendar entered as an integer value to the Japanese calendar.

specification

• The objects of the Japanese calendar are Meiji, Taisho, Showa, Heisei, and Reiwa.
• The first year of the Meiji era is 1868.
• If it is older than the Meiji era, it is treated as an exception.

What you can do

The response will be like this.

Please enter the year.
2020
The year 2020 is the second year of Reiwa.

What to use

Variables, assignments, if elif else statements, four rules operations, character input, comparison operations, and logical operations are used.

code

nengo.py

int_input = int(input("Please enter the year.\n"))

#Meiji
if(int_input >= 1868 and int_input <=1911):
	str_nengo = "Meiji"
	int_year = int_input - 1867
	if(int_year == 1):
		int_lastYear = int_input - 1864
		str_lastYear = "Keio"
		print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')
	else:
		print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

#Taisho
elif(int_input >=1912 and int_input <=1925):
	str_nengo = "Taisho"
	int_year = int_input - 1911
	if(int_year == 1):
		int_lastYear = int_input - 1867
		str_lastYear = "Meiji"
		print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')
	else:
		print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

#Showa
elif(int_input >=1926 and int_input <=1988):
	str_nengo = "Showa"
	int_year = int_input - 1925
	if(int_year == 1):
		int_lastYear = int_input - 1911
		str_lastYear = "Taisho"
		print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')
	else:
		print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

#Heisei
elif(int_input >=1989 and int_input <=2018):
	str_nengo = "Heisei"
	int_year = int_input - 1988
	if(int_year == 1):
		int_lastYear = int_input - 1925
		str_lastYear = "Showa"
		print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')
	else:
		print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

#Reiwa
elif(int_input >=2019):
	str_nengo = "Reiwa"
	int_year = int_input - 2018
	if(int_year == 1):
		int_lastYear = int_input - 1988
		str_lastYear = "Heisei"
		print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')
	else:
		print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

#Exception handling
else:
	# if(int_input < 1868):
	print("Year", int_input , "The year is quite old.\n",sep='')

Construction

Input part of the Christian era

python

int_input = int(input("Please enter the year.\n"))

ʻInt_input A variable that stores the entered year. Since it is an integer, it is ʻint_. ʻInput ()Character input ʻInt (input ())Restricts input as an integer \ n Line break at the end (no need to break)

Processing when the entered year is the Meiji era

python

#Meiji
if(int_input >= 1868 and int_input <=1911):
    str_nengo = "Meiji"
    int_year = int_input - 1867

ʻIf (): if statement. ʻInt_input> = 1868 Condition 1. If the entered year is after 1868. ʻInt_input <= 1911 Condition 2. If the entered year is before 1911. ʻAnd logical operator. Meiji when both conditions are met.

A variable that stores the str_nengo year. Since it is a character string, it is called str_. ʻInt_year A variable that stores the year of the Japanese calendar. ʻInt_input --1867 Subtract 1867 from the entered year to get the year of the Meiji era.

Processing when it was the first year of the Meiji era

python

    if(int_year == 1):
        int_lastYear = int_input - 1864
        str_lastYear = "Keio"

If it was one year, it is also the last year of the previous era.

1868 AD is the first year of the Meiji era (4th year of Keio). I want to write .

So I added another condition. Create a nested if statement inside the first if statement.

ʻIf (int_year == 1): If the Japanese calendar year ʻint_year is 1. ʻInt_lastYearThe last year of the previous era. Here, we are looking for the final year (4) of Keio. str_lastYear` The previous era.

Now you are ready to output.

Output when it was the first year

python

print("Year", int_input , "Year is", str_nengo, "First year (", str_lastYear, int_lastYear ,"Year).\n",sep='')

print () A function that prints. Multiple elements are concatenated and output using ,. " AD " This is a character string. When printing a character string, enclose it in quotation marks. ʻInt_inputThis is a variable. If you want to print the variable, leave it as it is. " First year (", str_lastYear, int_lastYear," year) The previous era and last year. \ nLine break. sep =''Separate specification. By default, there is a space between the elements so it looks a little longer. If you specifysep` in the blank, it will be output without spaces.

Normal output (if not the first year)

python

print("Year", int_input , "Year is", str_nengo, int_year, "It's the year.\n",sep='')

Only the processing of the "first year" part is deleted.

This completes the Meiji era. Next is Taisho, Showa, Heisei, and Reiwa.

Basically, it has the same structure as the Meiji era, Meiji is ʻif sentence, Taisho, Showa, Heisei, and Reiwa are ʻelif.

For ʻif, you can set the second and subsequent conditions with ʻelif.

In the case of Reiwa

python

#Reiwa
elif(int_input >=2019):

Since the final year is not fixed, there is only one condition.

Exception handling

python

else:
    # if(int_input < 1868):
    print("Year", int_input , "The year is quite old.\n",sep='')

ʻElse is used as opposed to the previous ʻif and ʻelif. ʻElse is a process other than the conditions described so far.

Specifically, this is the case when the Christian era is older than 1868.

This time, we are targeting Meiji, Taisho, Showa, Heisei, and Reiwa. In terms of numbers, it is output that the target is after 1868, and before that it is a fairly old age.

the end

That's it.

I created it as an example using the basic description. Thank you for reading.

Information that I was allowed to refer to

Qiita Python basic course (8 branches)

note.nkmk.me Print strings, numbers and variable values with Python's print function