input_reader 1.2.2

便于读取输入文件的python模块

input_reader用于定义和读取程序的常规输入文件。 这个README只包含brief什么input_reader可以 去吧。有关api的更详细描述，请参见文档 在http://packages.python.org/input_reader。API的灵感来自 argparse模块来自python标准库，因此希望它是 易学。

问题

假设你要写一个做饭的程序。你有 以下要求：

1. The user must specify one and only one of breakfast, lunch, or dinner.

   1. For breakfast, the user must specify scrambled or poached eggs and how many eggs. Also, the user specifies waffles or pancakes, and specifies if they want butter and/or syrup. The user may optionally request bacon.
   2. For lunch, the user must specify if they want a sandwich (BLT, ham, or turkey) or soup (vegetable or chili). The user also specifies if they want bread.
   3. For dinner, the user specifies steak (rare, medium or well), salmon, or pasta (red or white sauce). There is a choice of soup or salad. The user may also choose to have dessert.

2. 用户必须指定一种饮料，该饮料可以是水、牛奶， 啤酒、苏打水或葡萄酒。

3. 用户可以要求有机餐和/或无麸质。

我们希望输入文件如何

假设有人想要一份加糖浆煎饼的炒鸡蛋早餐 还有培根，还有一杯酒。下面是我们如何定义输入：

drink oj

breakfast
    eggs 2 scrambled
    pancakes syrup
    bacon
end

或者，如果一个面筋过敏的人想和酒一起吃晚餐怎么办。他们想要 中号牛排加色拉，他们要甜点。输入如下：

nogluten

drink wine

dinner
    steak medium
    salad
    dessert
end

input_reader代码

为了定义上述要求，我们将使用以下代码：

importsysfrominput_readerimportInputReader,ReaderErrorreader=InputReader()# Gluten free or organic meal?  These are simple booleansreader.add_boolean_key('nogluten')reader.add_boolean_key('organic')# The drink has an argument, and accepts a specific list of valuesreader.add_line_key('drink',type=('water','milk','oj','beer','soda','wine'))# We are allowed to specify breakfast, lunch or dinner, so we use# a mutually exclusive group.  We need one of these, so we call this# required.meal=reader.add_mutually_exclusive_group(required=True)# We define the breakfast blockbfast=meal.add_block_key('breakfast')# Eggs, number of eggs then the stylebfast.add_line_key('eggs',type=[int,('scrambled','poached')],required=True)# Pancakes OR waffles.  Syrup and/or butter is optionalwp=bfast.add_mutually_exclusive_group(required=True)wp.add_line_key('waffles',type=None,glob={'len':'*','type':('syrup','butter')})wp.add_line_key('pancakes',type=None,glob={'len':'*','type':('syrup','butter')})# BACON!bfast.add_boolean_key('bacon')# The lunch blocklunch=meal.add_block_key('lunch')# Bread?lunch.add_boolean_key('bread')# Sandwitch or soupss=lunch.add_mutually_exclusive_group(required=True)ss.add_line_key('sandwich',type=('blt','ham','turkey'))ss.add_line_key('soup',type=('vegetable','chili'))# The dinner blockdinner=meal.add_block_key('dinner')# Dessert?dinner.add_boolean_key('dessert')# Soup or salad?ss=dinner.add_mutually_exclusive_group()ss.add_boolean_key('soup')ss.add_boolean_key('salad')# Main coursemcourse=dinner.add_mutually_exclusive_group(required=True)mcourse.add_line_key('steak',type=('rare','medium','well'))mcourse.add_boolean_key('salmon')mcourse.add_line_key('pasta',type=('red','white'))

您可以按以下方式读入和分析文件：

# Assuming the input file is in argv[1], read in the input filetry:inp=reader.read_input(sys.argv[1])exceptReaderErrorase:sys.exit(str(e))# Is the meal gluten free?ifinp.nogluten:...# Is lunch served?ifinp.lunch:# If so, what type of soup?ifinp.lunch.soup=='chili':...# Etc...

作者

塞思·莫顿

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