Python---索引

Python索引類似于C/C++,JAVA中的數組，下标從0開始。和C++，java中的數組不同的是，Python中可以使用負數索引，當使用負數索引時，Python會從最後一個元素開始計數。如：str = 'hello',str[-1]就為'o'。下面來個示例展示一下：示例要求是根據輸入的年月日輸出相應的日期。

# coding=utf-8
#  根據給定的年月日以數字形式列印出日期
months = ['January', 'February', 'March', 'April', 'May', 'June', 'July',
          'August', 'September', 'October', 'November', 'December']
# 17*['th']是給endings添加17個"th"字元串
endings = ['st', 'nd', 'rd'] + 17*['th']\
        + ['st', 'nd', 'rd'] + 7*['th']\
        + ['st']
year = raw_input('year:')
month = raw_input('month:')
day = raw_input('day:')
month_number = int(month)
day_number = int(day)
month_name = months[month_number-1]
ordinal = day + endings[day_number-1]
print month_name + " " + ordinal + " " + year + "\n"