tox-pyenv dependency

tox configuration file

envlist configuration

basepython specification

test commands

test dependencies

pyenv which usage

Subprocess execution

pyenv binary discovery

Exit code handling

stdout parsing

Error differentiation

Pyenv subprocess execution

Pyenv binary detection

Fallback mechanism implementation

Strict mode enforcement

PyenvWhichFailed exception

Exit code handling

Error output capture

Logger initialization

Warning log usage

Debug log usage

Command logging

Error output logging

Base Exception Class

Executable Not Found Exception

Execution Failed Exception

Exception Hierarchy Structure

Error Context Preservation

Appropriate Exception Raising

testenv Section Structure

tox_pyenv_fallback Attribute

Boolean Value Format

Configuration Management

Subprocess execution

Stream capture

Text handling

Exit code checking

OSError handling

Exception hierarchy

Error context

subprocess execution

stdout capture

exit code handling

OSError handling

fallback on failure

fallback on OSError

empty result handling

pyenv which usage

Local version detection

Global version detection

Subprocess output handling

Error handling

Multiple version handling

Hook implementation

Argument group creation

Command-line argument

Testenv attribute registration

Postprocessing function

Precedence logic