Another question, python_binary could only accept 1 file in sources ?

ERROR: The 'sources' field in target XXXX:XXXX must have 0 or 1 files, but it had 2 files.

could I include more than 1 file for pants binary ?

Hi, for

binary

targets, if it uses more than 1 source file, you’ll want to create a

python_library

with the other files and include it in

dependencies

.

python_binary

should either have no source files or one, such as

app.py

or

main.py

. This allows Pants to infer what the

entry_point

is if you end up leaving off that field. For example

# example/BUILD

# this will use the default sources of `*.py`
# and the default target name of `example:example`
python_library()

python_binary(
  name="app",
  dependencies=[':example'],
)

got it, so for example, I could only put main.py in my binary and all other codes and resources in library ?

Exactly. More specifically, you’d put the other Python code in `python_library`(s) and you would put resource files in the

resources()

target

Thanks, it works!

You can also have the

main.py

in the

python_library

and have no sources at all in the

python_binary

(but you then must explicitly specify the

entry_point=

in the

python_binary

). If you have a single source in your

python_binary

then you can leave off the

entry_point=

because Pants will assume that the single source is the entry point module.