Question

我有一个像这样的Javascript文件Commodity.js：

commodityInfo = [
["GLASS ITEM", 1.0, 1.0, ], 
["HOUSEHOLD GOODS", 3.0, 2.0, ], 
["FROZEN PRODUCTS", 1.0, 3.0, ], 
["BEDDING", 1.0, 4.0, ], 
["PERFUME", 1.0, 5.0, ], 
["HARDWARE", 5.0, 6.0, ], 
["CURTAIN", 1.0, 7.0, ], 
["CLOTHING", 24.0, 8.0, ], 
["ELECTRICAL ITEMS", 1.0, 9.0, ], 
["PLUMBING MATERIAL", 1.0, 10.0, ], 
["FLOWER", 7.0, 11.0, ], 
["PROCESSED FOODS.", 1.0, 12.0, ], 
["TILES", 1.0, 13.0, ], 
["ELECTRICAL", 9.0, 14.0, ], 
["PLUMBING", 1.0, 15.0, ]
];

我想遍历每个项目，如GLASS ITEM，HOUSEHOLD GOODS，FROZEN PRODUCTS，并使用旁边的数字进行一些使用python的计算。有人可以告诉我如何在python中打开和迭代这些项目。

感谢你。

Answer 1

以下代码可能效率最高，但适用于您的情况。

我在这里做的是：将字符串（文件的内容）转换为有效的JSON，然后将JSON字符串加载到Python变量中。

注意：如果您的JS文件的内容已经是有效的JSON，那将会更容易！

import re
import json

# for the sake of this code, we will assume you can successfully load the content of your JS file
# into a variable called "file_content"
# E.G. with the following code:
#
# with open('Commodity.js', 'r') as f: #open the file
#     file_content = f.read()

# since I do not have such a file, I will fill the variable "manually", based on your sample data
file_content = """
commodityInfo = [
["GLASS ITEM", 1.0, 1.0, ],
["HOUSEHOLD GOODS", 3.0, 2.0, ],
["FROZEN PRODUCTS", 1.0, 3.0, ],
["BEDDING", 1.0, 4.0, ],
["PERFUME", 1.0, 5.0, ],
["HARDWARE", 5.0, 6.0, ],
["CURTAIN", 1.0, 7.0, ],
["CLOTHING", 24.0, 8.0, ],
["ELECTRICAL ITEMS", 1.0, 9.0, ],
["PLUMBING MATERIAL", 1.0, 10.0, ],
["FLOWER", 7.0, 11.0, ],
["PROCESSED FOODS.", 1.0, 12.0, ],
["TILES", 1.0, 13.0, ],
["ELECTRICAL", 9.0, 14.0, ],
["PLUMBING", 1.0, 15.0, ]
];
"""

# get rid of leading/trailing line breaks
file_content = file_content.strip()

# get rid of "commodityInfo = " and the ";" and make the array valid JSON
r = re.match(".*=", file_content)
json_str = file_content.replace(r.group(), "").replace(";", "").replace(", ]", "]")

# now we can load the JSON into a Python variable
# in this case, it will be a list of lists, just as the source is an array of array
l = json.loads(json_str)

# now we can do whatever we want with the list, e.g. iterate it
for item in l:
    print(item)

Answer 2

您可以使用for循环来实现这一目标。

这样的事情会起作用：

for commodity in commodityInfo:
    commodity[0] # the first element (e.g: GLASS ITEM)
    commodity[1] # the second element (e.g: 1.0)
    print(commodity[1] + commodity[2]) #calculate two values

您可以详细了解for循环here

使用Python迭代Javascript变量

2 个答案: