从命令行调用 Python 类方法
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Call Python class methods from the command line
提问by JadenBlaine
so I wrote some class in a Python script like:
所以我在 Python 脚本中编写了一些类，例如：
#!/usr/bin/python
import sys
import csv
filepath = sys.argv[1]
class test(object):
def __init__(self, filepath):
self.filepath = filepath
def method(self):
list = []
with open(self.filepath, "r") as table:
reader = csv.reader(table, delimiter="\t")
for line in reader:
list.append[line]
If I call this script from the command line, how am I able to call method? so usually I enter: $ python test.py test_file Now I just need to know how to access the class function called "method".
如果我从命令行调用这个脚本，我怎样才能调用方法？所以通常我输入： $ python test.py test_file 现在我只需要知道如何访问名为“method”的类函数。
采纳答案by Martijn Pieters
You'd create an instance of the class, then call the method:
您将创建该类的一个实例，然后调用该方法：
test_instance = test(filepath)
test_instance.method()
Note that in Python you don't haveto create classes just to run code. You could just use a simple function here:
请注意，在Python你不具备创建类只是运行代码。你可以在这里使用一个简单的函数：
import sys
import csv
def read_csv(filepath):
list = []
with open(self.filepath, "r") as table:
reader = csv.reader(table, delimiter="\t")
for line in reader:
list.append[line]
if __name__ == '__main__':
read_csv(sys.argv[1])
where I moved the function call to a __main__guard so that you can alsouse the script as a module and import the read_csv()function for use elsewhere.
我将函数调用移到了__main__守卫，以便您也可以将脚本用作模块并导入该read_csv()函数以在其他地方使用。
回答by Ishu Goyal
Open Python interpreter from the command line.
从命令行打开 Python 解释器。
$ python
Import your python code module, make a class instance and call the method.
导入您的 Python 代码模块，创建一个类实例并调用该方法。
>>> import test
>>> instance = test(test_file)
>>> instance.method()
