Difference between revisions of "Python:Functions"
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− | =Build in | + | =Self defined functions= |
+ | |||
+ | Arguments are positional but can be passed by keyword too. | ||
+ | |||
+ | <syntaxhighlight lang='python'> | ||
+ | def main(): | ||
+ | outcome = function(par1,par2) | ||
+ | function(par2 = <value>, par1 = <value>) | ||
+ | return | ||
+ | |||
+ | def function (inpar1, inpar2 = <defaultvalue>): | ||
+ | codeblock | ||
+ | return result | ||
+ | |||
+ | main() | ||
+ | </syntaxhighlight> | ||
+ | |||
+ | |||
+ | ;def function (*args,**kwargs): | ||
+ | :Take any number of positional arguments and put them in the [[Python:DataTypes#Tuple|tuple]] args | ||
+ | :Take any number of keyword arguments and put them in the [[Python:DataTypes#Dictionary_or_dict|dict]] kwargs | ||
+ | |||
+ | |||
+ | =Anonymous functions(lambda)= | ||
+ | lambda defines an anonymous function. | ||
+ | |||
+ | |||
+ | =Build in functions= | ||
List of all build in functions [https://docs.python.org/3/library/functions.html] | List of all build in functions [https://docs.python.org/3/library/functions.html] | ||
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time.sleep(<sec>) | time.sleep(<sec>) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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Revision as of 14:20, 7 September 2021
- sys._getframe( ).f_code.co_name
- Return name of current function
- You can pass a function-name as parameter
def main():
outcome = function1(function2,inpar2 = <value>)
return
def function1 (functiontocall, inpar2 = <defaultvalue>):
result = functiontocall(inpar2)
return result
def function2 (inpar):
codeblock
return result
main()
- eval(functionnameasstring)()
- Convert a function name as string to a function call
- WARNING: Make sure you have control over the string provided, you may call anything this way.
Self defined functions
Arguments are positional but can be passed by keyword too.
def main():
outcome = function(par1,par2)
function(par2 = <value>, par1 = <value>)
return
def function (inpar1, inpar2 = <defaultvalue>):
codeblock
return result
main()
- def function (*args,**kwargs)
- Take any number of positional arguments and put them in the tuple args
- Take any number of keyword arguments and put them in the dict kwargs
Anonymous functions(lambda)
lambda defines an anonymous function.
Build in functions
List of all build in functions [1]
- len(obj1)
- Return the number of elements in obj1 (string, list, tuple, set)
- max(obj1)
- Return the largest item in obj1
- min(obj1)
Return the smallest item in obj1
- round(x,y)
- Round x to y decimals
- input([prompt])
- Read and return input from standard input. Display 'prompt' first when provided.
- int(string[,base=x)])
- Convert str to an integer. Base = 2 converts bit-string presentation ('010101').
- str(object)
- repr(object)
- Return a string representation of an object. str for the informal representation (just make it printable), repr for the formal representation (more formating??)
Other often used functions
- Sleep function
import time
time.sleep(<sec>)