Failed to run pytest with allure on my docker image,"invalid syntax" - python-2.7

Question

I try to run pytest with allure on my docker image, but it reports an "invalid syntax" error. Is there any python version requirement for allure? The python version on my docker image is 2.7.13.
Can anyone help me?
root#ubuntu:/fuego-rw/buildzone# pytest allure_title.py
Traceback (most recent call last):
File "/usr/local/bin/pytest", line 11, in <module>
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 65, in main
config = _prepareconfig(args, plugins)
File "/usr/local/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 214, in _prepareconfig
pluginmanager=pluginmanager, args=args
File "/usr/local/lib/python2.7/dist-packages/pluggy/hooks.py", line 286, in __call__
return self._hookexec(self, self.get_hookimpls(), kwargs)
File "/usr/local/lib/python2.7/dist-packages/pluggy/manager.py", line 93, in _hookexec
return self._inner_hookexec(hook, methods, kwargs)
File "/usr/local/lib/python2.7/dist-packages/pluggy/manager.py", line 87, in <lambda>
firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
File "/usr/local/lib/python2.7/dist-packages/pluggy/callers.py", line 203, in _multicall
gen.send(outcome)
File "/usr/local/lib/python2.7/dist-packages/_pytest/helpconfig.py", line 94, in pytest_cmdline_parse
config = outcome.get_result()
File "/usr/local/lib/python2.7/dist-packages/pluggy/callers.py", line 81, in get_result
_reraise(*ex) # noqa
File "/usr/local/lib/python2.7/dist-packages/pluggy/callers.py", line 187, in _multicall
res = hook_impl.function(*args)
File "/usr/local/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 789, in pytest_cmdline_parse
self.parse(args)
File "/usr/local/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 997, in parse
self._preparse(args, addopts=addopts)
File "/usr/local/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 943, in _preparse
self.pluginmanager.load_setuptools_entrypoints("pytest11")
File "/usr/local/lib/python2.7/dist-packages/pluggy/manager.py", line 299, in load_setuptools_entrypoints
plugin = ep.load()
File "/usr/local/lib/python2.7/dist-packages/importlib_metadata/__init__.py", line 105, in load
module = import_module(match.group('module'))
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/usr/local/lib/python2.7/dist-packages/_pytest/assertion/rewrite.py", line 304, in load_module
exec(co, mod.__dict__)
File "/usr/local/lib/python2.7/dist-packages/allure_pytest/plugin.py", line 3, in <module>
import allure
File "/usr/local/lib/python2.7/dist-packages/allure.py", line 1, in <module>
from allure_commons._allure import title
File "/usr/local/lib/python2.7/dist-packages/allure_commons/__init__.py", line 3, in <module>
from allure_commons._allure import fixture # noqa: F401
File "/usr/local/lib/python2.7/dist-packages/allure_commons/_allure.py", line 165
def __call__(self, func: _TFunc) -> _TFunc:
^
SyntaxError: invalid syntax

Answer 1

This syntax:
func: _TFunc
is called a type hint, meaning the variable func is expected to be of type _TFunc (in simpler terms, num: int means the variable num is expected to be int).
The type hint feature was only made available from Python3.0 (PEP 3107) and Python3.5 (PEP 484), thus isn't available in the version you are using which is Python2.7.
def func(num: int):
print(num)
func(1)
Using Python2
File "Main.py", line 1
def func(num: int):
^
SyntaxError: invalid syntax
Using Python3
1
Either upgrade your Python version to >=3.5 or use an older version of allure-pytest. I would advise to upgrade Python as that would be more sustainable.