from datetime import datetime
def next_month(mm):
# 与えられた月を1加算し、範囲を1～12に制限する
next_mm = (mm + 1) % 13
if next_mm == 0:
next_mm = 1
return next_mm
# テスト
current_month = datetime.now().month
next_month_number = next_month(current_month)
print("今月:", current_month)
print("翌月:", next_month_number)
