Python - overriding function parameters
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Writing a cli function that should do the following:
In case, the function parameters are not set (I get them from docopt),
I would like to look them up from environment.
The following does not work due to fast loading in functions:
def my_function(a=None, b=None, c=None):
for v in ("a", "b", "c"):
if vars()[v] is None:
locals()[v] = getenv("env_{}".format(v).upper())
do_something_with(a, b, c)
What would be the pythonic way to achieve this?
python python-3.x
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
add a comment |
Writing a cli function that should do the following:
In case, the function parameters are not set (I get them from docopt),
I would like to look them up from environment.
The following does not work due to fast loading in functions:
def my_function(a=None, b=None, c=None):
for v in ("a", "b", "c"):
if vars()[v] is None:
locals()[v] = getenv("env_{}".format(v).upper())
do_something_with(a, b, c)
What would be the pythonic way to achieve this?
python python-3.x
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
add a comment |
Writing a cli function that should do the following:
In case, the function parameters are not set (I get them from docopt),
I would like to look them up from environment.
The following does not work due to fast loading in functions:
def my_function(a=None, b=None, c=None):
for v in ("a", "b", "c"):
if vars()[v] is None:
locals()[v] = getenv("env_{}".format(v).upper())
do_something_with(a, b, c)
What would be the pythonic way to achieve this?
python python-3.x
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
Writing a cli function that should do the following:
In case, the function parameters are not set (I get them from docopt),
I would like to look them up from environment.
The following does not work due to fast loading in functions:
def my_function(a=None, b=None, c=None):
for v in ("a", "b", "c"):
if vars()[v] is None:
locals()[v] = getenv("env_{}".format(v).upper())
do_something_with(a, b, c)
What would be the pythonic way to achieve this?
python python-3.x
python python-3.x
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
asked Jan 4 at 13:59
ProfHase85ProfHase85
7,36433648
7,36433648
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can do this easily with keyword arguments:
def my_function(**kwargs):
for var in ('a', 'b', 'c'):
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(v).upper())
do_something_with(**kwargs)
If you want to keep the signature, you can create a decorator (functools.wraps takes care of aligning the signatures):
def defaults_from_env(function):
@functools.wraps(function)
def wrapper(**kwargs):
for var in kwargs:
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(var).upper())
return function(**kwargs)
return wrapper
@defaults_from_env
def my_function(a=None, b=None, c=None):
print(a, b, c)
However, this forces you to name all parameters when calling the decorated my_function (i.e. a=.., b=.., c=..). To avoid this, you could use inspect.signature to bind the parameters in the wrapper; this would allow you to get the name and value of all parameters, both *arg and **kwarg.
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can do this easily with keyword arguments:
def my_function(**kwargs):
for var in ('a', 'b', 'c'):
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(v).upper())
do_something_with(**kwargs)
If you want to keep the signature, you can create a decorator (functools.wraps takes care of aligning the signatures):
def defaults_from_env(function):
@functools.wraps(function)
def wrapper(**kwargs):
for var in kwargs:
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(var).upper())
return function(**kwargs)
return wrapper
@defaults_from_env
def my_function(a=None, b=None, c=None):
print(a, b, c)
However, this forces you to name all parameters when calling the decorated my_function (i.e. a=.., b=.., c=..). To avoid this, you could use inspect.signature to bind the parameters in the wrapper; this would allow you to get the name and value of all parameters, both *arg and **kwarg.
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
add a comment |
You can do this easily with keyword arguments:
def my_function(**kwargs):
for var in ('a', 'b', 'c'):
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(v).upper())
do_something_with(**kwargs)
If you want to keep the signature, you can create a decorator (functools.wraps takes care of aligning the signatures):
def defaults_from_env(function):
@functools.wraps(function)
def wrapper(**kwargs):
for var in kwargs:
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(var).upper())
return function(**kwargs)
return wrapper
@defaults_from_env
def my_function(a=None, b=None, c=None):
print(a, b, c)
However, this forces you to name all parameters when calling the decorated my_function (i.e. a=.., b=.., c=..). To avoid this, you could use inspect.signature to bind the parameters in the wrapper; this would allow you to get the name and value of all parameters, both *arg and **kwarg.
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
add a comment |
You can do this easily with keyword arguments:
def my_function(**kwargs):
for var in ('a', 'b', 'c'):
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(v).upper())
do_something_with(**kwargs)
If you want to keep the signature, you can create a decorator (functools.wraps takes care of aligning the signatures):
def defaults_from_env(function):
@functools.wraps(function)
def wrapper(**kwargs):
for var in kwargs:
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(var).upper())
return function(**kwargs)
return wrapper
@defaults_from_env
def my_function(a=None, b=None, c=None):
print(a, b, c)
However, this forces you to name all parameters when calling the decorated my_function (i.e. a=.., b=.., c=..). To avoid this, you could use inspect.signature to bind the parameters in the wrapper; this would allow you to get the name and value of all parameters, both *arg and **kwarg.
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
You can do this easily with keyword arguments:
def my_function(**kwargs):
for var in ('a', 'b', 'c'):
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(v).upper())
do_something_with(**kwargs)
If you want to keep the signature, you can create a decorator (functools.wraps takes care of aligning the signatures):
def defaults_from_env(function):
@functools.wraps(function)
def wrapper(**kwargs):
for var in kwargs:
if kwargs.get(var) is None:
kwargs[var] = getenv("env_{}".format(var).upper())
return function(**kwargs)
return wrapper
@defaults_from_env
def my_function(a=None, b=None, c=None):
print(a, b, c)
However, this forces you to name all parameters when calling the decorated my_function (i.e. a=.., b=.., c=..). To avoid this, you could use inspect.signature to bind the parameters in the wrapper; this would allow you to get the name and value of all parameters, both *arg and **kwarg.
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
edited Jan 4 at 14:22
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
answered Jan 4 at 14:01
BlackBearBlackBear
15.5k83368
15.5k83368
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
add a comment |
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
Thanks, thought about that. Unfortunately with kwargs I have no control over function params that are passed to the function and i would need to write: 1. a validator (to prevent parameters that are not allowed to be passed) 2. some extra parameter hinting for my ide, 3. I am not able to pass parameters by order
– ProfHase85
Jan 4 at 14:11
add a comment |
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