What is Python all() function and how it works for beginners?
In this post, we’ll learn about Python all() function and how it works for beginners with real-life examples to make learning easier.
Table of Contents
Introduction
Python all() function returns true if the object is iterable. It takes iterable as a single argument and returns a boolean value.
Syntax
all(iterable)
Examples
Checking what the all() the function returns when used with list, tuples, sets, and dictionaries.
# on list
mylist = [1,2,3]
x = all(mylist)
print("On list {}\n".format(x))
# on empty list
mylist = []
x = all(mylist)
print("On empty list {}\n".format(x))
# on tuples
myTuple = ("this", "is", "tuple")
x = all(myTuple)
print("On empty list {}\n".format(x))
# on empty tuples
myTuple = ()
x = all(myTuple)
print("On empty list {}\n".format(x))
# on sets
mySet = {"this", "is", "sets"}
x = all(mySet)
print("On empty set {}\n".format(x))
# on empty sets
mySet = {}
x = all(mySet)
print("On empty set {}\n".format(x))
# on dictionary
myDict = {"name" : "james", "age" : 12}
x = all(myDict)
print("On Dictionary {}\n".format(x))
# on empty dictionary
myDict = {}
x = all(myDict)
print("On empty Dictionary {}\n".format(x))
# PYTHON OUTPUT
On list : True
On empty list : True
On Tuple : True
On empty Tuple : True
On set : True
On empty set : True
On Dictionary : True
On empty Dictionary : True
The all() function also works on strings.
myStr = "Welcome to Python"
x = all(myStr)
print("On String {}\n".format(x))
# on empty string
myStr = ""
x = all(myStr)
print("On empty String {}\n".format(x))
# PYTHON OUTPUT
On String True
On empty String True
On range() function.
x = all(range(0,6))
print("On range function 1 : {}\n".format(x))
x = all(range(1,6))
print("On range function 2 : {}\n".format(x))
# PYTHON OUTPUT
On range function 1 : False
On range function 2 : True
You can see that for range(0,6) the all() function returns False and for range(1,6) returns True
Let us look at another example using a list, tuples, etc.
On iterable objects with the item as False or numeric zero number.
# on list
mylist = [0,1,False]
x = all(mylist)
print("On list : {}\n".format(x))
# on tuples
myTuple = (0, False)
x = all(myTuple)
print("On Tuple : {}\n".format(x))
# on sets
mySet = {0, False}
x = all(mySet)
print("On set : {}\n".format(x))
# on dictionary
myDict = {0 : "james", 0 : 12}
x = all(myDict)
print("On Dictionary : {}\n".format(x))
# on string
myStr = "0"
x = all(myStr)
print("On String {}\n".format(x))
# PYTHON OUTPUT
On list : False
On Tuple : False
On set : False
On Dictionary : False
On String True
So by these examples, we come to know that all() function result may change if one of its items is 0 or False.
If items are not zero nor False than it returns True and for zero as a string, it returns True.
Conclusion
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