Control Structures Python like conditions and loops

Control Structures
A control structure is a block of programming that analyzes variables and
decides which statement to execute next, based on the given parameters.
The term ‘control’ denotes the direction in which the program flows.
Usually, loops are used to execute a control statement, a certain number
of times.
Basically, control structures determine the flow of events in the program.
If statement: This is used to check a condition and executes the
operations/statements within the if block only when the given condition is
true.
Syntax:
if condition:
True Statements

If…else statements
If…else statements: These statements are used to check a
condition and executes the operations/statements within
the if block only when the given condition is true. If the
given condition is false, the statements in the else block
will be executed.
Syntax:
if condition:
True Statements
else:
False Statements

If …elif… else statements
If …elif… else statements: If we want to check more than one condition we can use
the elif statements. If a condition is true then the statements within the if block
will be executed. If the condition is false, we can provide an elif statement with a
second condition and the statements within the elif block will be executed only
when the condition is true. We can provide multiple elif statements and an else
statement at the end if all the above conditions are false.
Syntax:
if condition:
True Statements
elif condition2:
True Statements
elif condition3:
True Statements
…….
else:
False Statements

Loops in Python
• Loops are used to repeat a set of statements/single statement, a certain
number of times. In Python, there are two loops, for loop and while loop. The
Python for loop also works as an iterator to iterate over items in
list/dictionary or characters in strings.
for Loop: It can be used to iterate over a list/string/dictionary or iterate over a
range of numbers.
Syntax:
for variable in range(starting number , ending number + 1 , step size):
statements
(or)
for element in sequence:
statements

While Loop
While Loop: This is used, whenever a set of statements should be
repeated based on a condition. The control comes out of the loop
when the condition is false. In while loop we must explicitly
increment/decrement the loop variable (if any) whereas in for, the
range function would automatically increment the loop variable.
Syntax:
while condition:
statement(s)
increment/decrement

Break and Continue Statement
break statement: This statement is used to terminate the loop it is present in. Control
goes outside the loop it is present in. If a break statement is present in a nested
loop, it only comes out of the innermost loop.
Syntax:
while condition:
statments
if condition:
break
statements
Continue statement: This statement is used to skip the current iteration. The loop will
not be terminated, it just won’t execute the statements below the continue
statement. The incrementing will be done in for loop. If the increment statement is
written below continue, it won’t be executed in while loop.
Syntax:
while condition:
statement(s)
if condition:
continue
statements

Pass Statement
Pass statement: This statement is used as placeholder. For example, we
want to create a function but are not sure of its content. If we create a
function and leave it, an error will occur. To counter this error, we use
pass statement.
Syntax:
def function(parameters):
pass
(or)
for elements in sequence:
pass
(or)
while condition:
pass
(or)
if condition:
pass

Control Structures Python like conditions and loops

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