There's a new version of sh available.
You are currently using 1.11. I have updated it to 1.12.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.12.0

• composed commands no longer propagate _bg
• better support for using sys.stdin and sys.stdout for _in and _out
• bugfix where which() would not stop searching at the first valid executable found in PATH
• added _long_prefix for programs whose long arguments start with something other than -- 278
• added _log_msg for advanced configuration of log message 311
• added sh.contrib.sudo
• added _arg_preprocess for advanced command wrapping
• alter callable _in arguments to signify completion with falsy chunk
• bugfix where pipes passed into _out or _err were not flushed on process end 252
• deprecated with sh.args(**kwargs) in favor of sh2 = sh(**kwargs)
• made sh.pushd thread safe
• added .kill_group() and .signal_group() methods for better process control 237
• added new_session special keyword argument for controlling spawned process session 266
• bugfix better handling for EINTR on system calls 292
• bugfix where with-contexts were not threadsafe 247
• _uid new special keyword param for specifying the user id of the process 133
• bugfix where exceptions were swallowed by processes that weren't waited on 309
• bugfix where processes that dupd their stdout/stderr to a long running child process would cause sh to hang 310
• improved logging output 323
• bugfix for python3+ where binary data was passed into a process's stdin 325
• Introduced execution contexts which allow baking of common special keyword arguments into all commands 269
• Command and which now can take an optional paths parameter which specifies the search paths 226
• _preexec_fn option for executing a function after the child process forks but before it execs 260
• _fg reintroduced, with limited functionality. hurrah! 92
• bugfix where a command would block if passed a fd for stdin that wasn't yet ready to read 253
• _long_sep can now take None which splits the long form arguments into individual arguments 258
• making _piped perform "direct" piping by default (linking fds together). this fixes memory problems 270
• bugfix where calling next() on an iterable process that has raised StopIteration, hangs 273
• sh.cd called with no arguments no changes into the user's home directory, like native cd 275
• sh.glob removed entirely. the rationale is correctness over hand-holding. 279
• added _truncate_exc, defaulting to True, which tells our exceptions to truncate output.
• bugfix for exceptions whose messages contained unicode
• _done callback no longer assumes you want your command put in the background.
• _done callback is now called asynchronously in a separate thread.
• _done callback is called regardless of exception, which is necessary in order to release held resources, for example a process pool

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖