Python List - Count Method

Method Name:

count

Method Signature:

count()

Overview:

The method returns the number of times an element appears in the list.
To find the number of elements in a list use the len() function.

Parameters:

element - The element whose occurence in the list needs to be counted.

Return value:

None

Example 1:

# Example Python program that finds the number of occureneces of an item in a list

# Create a list
objects = ["Curtain",
           "Picture",
           "Curtain",
           "Wall light",
           "Table lamp",
           "Torch",
           "Pen",
           "Note pad",
           "Pen",
           "TV",
           "Telephone"];

# Element to find
objectToCount = "Curtain";

# Number of elements found
objectCount = objects.count(objectToCount);
print("There are %d %ss in the list"%(objectCount,
objectToCount));

# Element to find
objectToCount = "TV";

# Number of elements found
objectCount = objects.count(objectToCount);
print("There are %d %ss in the list"%(objectCount,
objectToCount));

Output:

There are 2 Curtains in the list
There are 1 TVs in the list

Example 2:

# Example Python program that finds the number
# of objects of same attributes using the count() method
class Door:
   def __init__(self, width, height, thickness):
       self.width       = width;
       self.height    = height;
       self.thickness    = thickness;

   def __eq__(self, object):
       if (self.width == object.width) and (self.height == object.height) and (self.thickness == object.thickness):
           return True;
       else:
           return False;

# Create doors
d1 = Door(3, 9, 0.2);
d2 = Door(3, 9, 0.2);
d3 = Door(3, 10, 0.2);
d4 = Door(3, 9, 0.2);

# Create a list of doors
doors = [d1, d2, d3, d4];

# Find doors whose width = 3, height = 9, thickness = 0.2
doorCount = doors.count(d1);
print("Doors found with the same attributes: %d"%doorCount);

Output:

Doors found with the same attributes: 3