The Python all() function returns true if all the elements of a given iterable (List, Dictionary, Tuple, set, etc.) are True otherwise it returns False. It also returns True if the iterable object is empty. Sometimes while working on some code if we want to ensure that user has not entered a False value then we use the all() function.
Python all() Function in Python
Syntax: all( iterable )
- Iterable: It is an iterable object such as a dictionary,tuple,list,set,etc.
Returns: boolean
Python all() Function with Example
Python3
print(all([True, True, False]))
|
Output:
False
Example 1: Working of all() with Lists
Here we are considering list as a iterable.
Python3
l = [4, 5, 1]
print(all(l))
l = [0, 0, False]
print(all(l))
l = [1, 0, 6, 7, False]
print(all(l))
l = []
print(all(l))
l = [1,-3,0,2,4]
print(all(ele > 0 for ele in l))
|
Output
True
False
False
True
False
Example 2: Working of all() with Tuples
Here we are considering a tuple as a iterable.
Python3
t = (2, 4, 6)
print(all(t))
t = (0, False, False)
print(all(t))
t = (5, 0, 3, 1, False)
print(all(t))
t = ()
print(all(t))
l = (2,4,6,8,10)
print(all(ele % 2 == 0 for ele in l))
|
Output
True
False
False
True
True
Example 3: Working of all() with Sets
Here sets are referred to as iterables
Python3
s = {1, 1, 3}
print(all(s))
s = {0, 0, False}
print(all(s))
s = {1, 2, 0, 8, False}
print(all(s))
s = {}
print(all(s))
l = {-4,-3,6,-5,4}
print(all(abs(ele) > 2 for ele in l))
|
Output
True
False
False
True
True
Example 4: Working of all() with Dictionaries
Here we are considering dictionaries as iterables.
Python3
d = {1: "Hello", 2: "Hi"}
print(all(d))
d = {0: "Hello", False: "Hi"}
print(all(d))
d = {0: "Salut", 1: "Hello", 2: "Hi"}
print(all(d))
d = {}
print(all(d))
l = {"t":1, "i":1, "m":2, "e":0}
print(all(ele > 0 for ele in l.values()))
|
Output
True
False
False
True
False
Note: In the case of a dictionary if all the keys of the dictionary are true or the dictionary is empty the all() returns True, else it returns False.
Example 5: Working of all() with Strings
Python3
s = "Hi There!"
print(all(s))
s = "000"
print(all(s))
s = ""
print(all(s))
|
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Last Updated :
16 Feb, 2023
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