如何将列表/数组作为参数传递给python fire？

Question

I have function like this -

def my_func(my_list_arg=["one", "two"]):

Which I'm trying to call from command line using python-fire .

I have tried several ways -

---

Attempt 1:

fire_runner.py my_func [one, two]

Results in two separate arguments "[one" and "two]" .

---

Attempt 2:

fire_runner.py my_func ["one", "two"]

which has the same result.

---

Attempt 3:

fire_runner.py my_func [\"one\", \"two\"]

same result.

Answer 1

Your list will first be parsed by the command line shell. This means you need to force it as a single argument. There are many ways to do this:

1. No space: [one,two]

2. Escape the space: [one,\ two]

3. Quotes: "[one, two]" .

Note that you could modify your function to take a list of arguments using the following syntax:

def my_func(*args):

The name args here is convention, but it is just a variable name, so it can be anything. This will allow you to call your function as

fire_runner.py my_func one two

Answer 2

逗号对我有用后没有保留任何空格。

fire_runner.py my_func [one,two]

Answer 3

Adding this answer just for a special case.

given that your function is like this:

def my_func(dates: List[str] = []):
    ...

In case you need to send list of dates (or any combination of numbers and characters) from the CLI, the following WON'T work.

fire_runner.py my_func --dates 2021-09-20,
fire_runner.py my_func --dates "[2021-09-20]"
fire_runner.py my_func --dates [2021-09-20]

In all the above cases, dates will be read as one string instead of list of strings. For proper reading of list of strings you can use the following.

fire_runner.py my_func --dates "[\"2021-09-20\"]"
fire_runner.py my_func --dates "[\"2021-09-20\", \"2021-09-76\"]"

Answer 4

Fire converts a comma-separated digit string to tuple as follows:

fire_runner.py my_func  1,2,3

and for a comma-separated string you can use:

fire_runner.py my_func  \'2021-2\',\'20212-3\',\'2023-4\'

Answer 5

为一个元素列表添加特殊的极端情况解决方案，因为上述语法似乎不起作用（列表被解析为以[开头的字符串）：

fire_runner.py my_func "['one']"