Applying Conditions in Python (If - else statement) - Ryzen Hunt
Conditions in Python
In some programs, we need to define some conditions. Here we have described, how you can apply conditions in your Python program.
There are certain keywords available in Python that are used to define one or more conditions in your Python program. Comparison operators are also used to give a condition with the conditional keyword.
If - statement
This is the simplest conditional statement. An
if - statement
is written by using the
if
keyword. The syntax for if - statement is:
if (Condition):
(Statement)
Example:
>>> a = 45
>>> b = 56
>>> if a != b :
print("Condtion is True.")
Output:
Condition is True.
If - else statement
In case, the condition defined in the if-statement is not true, your program will through an error. In the previous example, if the condition would be false then you would receive an error as output.
To manage that error we use
else
keyword. The
else
keyword catches everything that is not caught by preceding conditions. The syntax for the if-else statement is:
if (Condition):
(Statement1)
else:
(Statement2):
In case the condition is true, Statement1 would be executed, otherwise Statement2 is executed.
Example:
>>> a = 4567
>>> b = 4567
>>> if a != b :
print("Condtion is True.")
>>> else:
print("Condition is False.")
Output:
Condition is False.
Elif - statement
Sometimes we need to define more than one condition in a program. We use
elif
keyword. Using elif keyword we can define any number of conditions in our program. The syntax is:
if (Condition1):
(Statement1)
elif (Condition2):
(Statement2)
else:
(Statement3):
Example:
>>> a = 67
>>>b = 68
>>> if a > b :
print("a is greater than b.")
>>> elif a < b:
print("b is greater than a.")
>>> else:
print("a equals b.")
Output
b is greater than a.
In some cases, we need to give condition inside a condition. To perform this action, we use
Nested-if Statement.
if Statement
inside an
if Statement
is called Nasted-if Statement.
Example:
>>> a = 69
>>> if a >25:
print("a is greater than 25")
if a > 50:
print("and also greater than 50.")
else:
print("but not greater than 50")
Output:
a is greater than 25
and also greater than 50.
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