basics of control statements in python
Control statements direct the flow of a Python program's execution. They introduce logic, decision-making, and looping. Key control statements in Python include if/else, for/while, break/continue, and pass. Let's get into our lesson to understand these concepts clearly.
Control Statements in Python
Flow control in Python is the process of controlling and directing the progression of program execution by utilizing conditional statements , iterative loops 🔁, and reusable functions 🔄. It helps govern a program's logic and coherence, permitting code to execute only when certain predefined conditions have been satisfied. In particular, flow control allows a program to make decisions :thinking: and perform repetitive tasks 🔁.
Conditional statements like if-else tests enable a program to evaluate expressions and execute code only if certain conditions are true or false. Loops like for and while loops enable a program to reiterate through a block of code multiple times. Functions 🔄 allow a program to encapsulate and call a code block from multiple locations.
Together, conditional statements , loops , and functions provide the mechanism to control the flow of a program and craft complex logic in a readable and maintainable fashion. Flow control is a foundational concept in programming that allows one to craft programs that can make judgments , perform recurring actions , and execute in a nonlinear manner. For these reasons, flow control is essential for creating Python programs that are versatile, capable, and resilient.
Let’s look at the control statements in python with examples for understanding:
Reservation Checking in Restaurant
Let's visualize this example first, then talk about it using Python code.
Reservation Checking in Restaurant
We require flow control to customize his program's flow and make it operate precisely how he wants it to. Moreover, he makes use of this in daily life. For instance, he determines if he can safely cross a road before we do so.🚦If not, we wait until the situation is safe before moving further. Just deciding which sentence should run before or after another, how the code should behave in specific circumstances, etc., is all he is doing. With Python, we have elegant, clear techniques to create flow control. 💻 Let's talk about them.
In Python, loops and conditional statements control code execution on a specific condition. There are two types of control statements in python, as discussed below:
"Conditional" refers to something dependent on a specific condition or circumstance. In programming, a conditional statement executes different codes based on whether a particular condition is true or false. 💡Three conditional statements will help him. Let's help him understand each one with an example.
if age >= 18: print("You are eligible to vote")
This code is an example of an if statement. It checks if the value stored in the variable "age" is greater than or equal to 18. If the statement is true, the code will print, "You are eligible to vote.”
x = 5 if x > 10: print("x is greater than 10") else: print("x is not greater than 10")
In this example, x is set to 5, using an if-else condition to test whether x is greater than 10. If x is greater than 10, it will print "x is greater than 10"; otherwise, it will print "x is not greater than 10".
x = 5 if x > 10: print("x is greater than 10") elif x<20: print("x is greater than 20") else: print("x is not greater than 10 and 20")
In this example, x is set to 5, and an if-else condition is used to test whether x is greater than 10. If x is greater than 10, it will print "x is greater than 10", else it will try if x is greater than 20; if x is greater than 20, it will print "x is greater than 20", otherwise it will print "x is not greater than 10 and 20".
Loop control statements in python are control structures in programming that allow a piece of code to be executed repeatedly, either a specific number of times or until a particular condition is met ⏰.
for i in range(11): print(i)
This program uses a for loop to iterate through numbers from 0 to 10. For each iteration, the value of i is printed. The for loop will continue until it reaches 11, which is not included in the range.
num = 1 while num <= 10: print(num) num = num + 1
This program prints the numbers from 1 to 10 using a while loop. The loop starts at 1 and continues until it reaches 10. The loop terminates when the value of num is greater than 10.
💡 Did You know?
In Python, you can check multiple conditions simultaneously using multiple comparisons. This is different from other programming languages, where you cannot randomly chain comparison operators and instead follow a particular order of operators.
This lesson provides an overview of control statements in Python, including their importance and types. Python control statements allow for logic, decision-making, and looping in a program. Conditional statements like if/else and loops like for/while are discussed, along with their syntax and examples
Answer: A) Execute code if a condition is true
Answer: D) Both A and C
Answer: B) Execute code if a condition is false
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