Let's say I put the function calls into list,
['next_release()', 'last_release("com_disagg")']
Hope to get the equivalent results of following
How could I get it in Python
iterate the array and dynamically call the function with params.
next_release()
last_release("com_disagg")
call head() method for each function
next_release().head()
last_release("com_disagg").head()
add print for each function
print next_release().head()
print last_release("com_disagg").head()
arr = ['next_release()', 'last_release("com_disagg")']
class t(object):
def head(self):
print "inside head"
return "head printed"
def next_release():
print "nr"
return t()
def last_release(var):
print var
return t()
for i in arr:
eval(i)
for i in arr:
print eval(i+".head()")
for i in arr:
print eval(i).head()
Output:
nr
com_disagg
nr
inside head
head printed
com_disagg
inside head
head printed
nr
inside head
head printed
com_disagg
inside head
head printed
Currently you're storing a string representing a function. That's probably not what you want since it'll force you to use eval which is usually bad.
You could get away with a mapping if you have to do it with strings:
mapping = {
'next_release()': next_release(),
'last_release("com_disagg")': last_release("com_disagg")
}
And now you can get the result using the mapping (mapping["next_release()"] ...).
There are two better options using actual functions and not strings:
If you want the list to store the functions' results (after calling them):
functions_results = [next_release(), last_release("com_disagg")]
list_of_functions_heads = [x.head() for x in list_of_functions_results]
If you want the list to store a functions' references (notice I closed the function with arguments in a lambda to create a parameter-less function:
functions_references = [next_release, lambda: last_release("com_disagg")]
list_of_functions_heads = [x().head() for x in list_of_functions_results]
You can use clsoure:
arr = ['next_release()', 'last_release("com_disagg")']
def next_release():
def head():
return x;
def last_release(var):
def head():
return y;
for i in arr:
print i.head()
