Hi all. Currently I am exploring Pants and I am enjoying it so far 🙂 I am facing something that I am still not sure if it is an misconfiguration on my side or an issue. Description I have a repo where the

requirements.txt

only has one dependency listed. This dependency lives in a private repository. After configuring the

.pants.rc

to set the index URL with the creds, when I run

./pants generate-lockfiles

it returns a list of the dependency versions available (since I haven’t constraint that in the

requirements.txt

). However, I noticed it doesn’t list the most recent ones. So I constraint the version to the most recent listed in the output of pants (let’s call it

version A

) and was able to generate the lockfile. However, when tried to constrain to the version that was released after that one (let’s call it

version B

), it couldn’t find a match distribution. I was inspecting the

setup.py

files in both distributions and found this change:

```
# version A
    'python_requires': '>=3.7.0,<3.8.0',

# version B
    'python_requires': '>=3.7.1,<3.8.0',
```

which aligns to the diff between the `pyproject.toml`s.

```
# version A
python = "~3.7.0"

# version B
python = "~3.7.1"
```

In the

pants.toml

I found that I was able to generate the lockfile for

version A

if

[python].interpreter_constraints = ["==3.7.*"]

. But if changes to

[python].interpreter_constraints = [">=3.7,<4"]

for example it can’t find matching distributions for the dependency. Has anyone faced something similar? Thanks in advance 🙂 EDIT: I am using

pex

as the

[python].lockfile_generator