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How to install additional python modules with pip.txt requirements file

pip requirements.txt documentation says that additional functions can be installed using a string like

MyPackage==3.0 [PDF]

So, in the requirements.txt file, I have a line that says:

requests==2.9.1 [security]

but instead of setting additional security elements for the query module when running the command:

pip install -r requirements.txt

An error message appears indicating the wrong file format:

Invalid requirement: 'requests==2.9.1 [security]'
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 77, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "/Library/Python/2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3036, in parse
    req, = parse_requirements(s)
  File "/Library/Python/2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2980, in parse_requirements
    "version spec")
  File "/Library/Python/2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2956, in scan_list
    raise RequirementParseError(msg, line, "at", line[p:])
RequirementParseError: Expected ',' or end-of-list in requests==2.9.1 [security] at  [security]

Does anyone know what I can do wrong?

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1 answer

The correct syntax is:

requests[security] == 2.9.1

, , pip v1.1, - v8.1. , , (PEP 0508).

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