Understand the types of flow control statements in Python and become the first step to become a Python expert!

Want to master Python? Let’s first understand how many types of Python flow control statements there are!

Python is a simple, easy-to-learn programming language that is widely used in many fields, such as data analysis, machine learning, and web development. For a programmer, it is essential to be proficient in Python's flow control statements. This article will introduce commonly used flow control statements in Python and provide specific code examples to help readers better understand and master these concepts.

1. Conditional Statements
Conditional statements execute the corresponding code block based on the true or false condition. Conditional statements in Python include if statements, if-else statements and if-elif-else statements.

1. if statement:
   The if statement is used to execute a piece of code when a certain condition is met. If the condition is True, the code within the if statement block is executed, otherwise it is skipped.

Sample code:

age = 18
if age >= 18:
    print("你已经成年了")

2. if-else statement:
   if-else statement is used to execute the code inside the if statement block when the condition is True, otherwise Execute the code within the else statement block.

Sample code:

age = 16
if age >= 18:
    print("你已经成年了")
else:
    print("你还未成年")

3. if-elif-else statement:
   if-elif-else statement is used to select a qualified one among multiple conditions Code block execution, when multiple conditions are met, only the first code block that meets the conditions is executed.

Sample code:

score = 90
if score >= 90:
    print("优秀")
elif score >= 80:
    print("良好")
elif score >= 60:
    print("及格")
else:
    print("不及格")

2. Loop statements
Loop statements are used to repeatedly execute a specific block of code multiple times. Loop statements in Python include while loops and for loops.

1. While loop:
   The while loop will execute the code in the loop body when the condition is True, and will not break out of the loop until the condition is False or a break statement is encountered.

Sample code:

count = 0
while count < 5:
    print(f"当前数字是：{count}")
    count += 1

2. for loop:
   The for loop is used to traverse an iterable object (such as a list, tuple, string, etc.), in sequence Execute the code inside the loop.

Sample code:

fruits = ["apple", "banana", "orange"]
for fruit in fruits:
    print(f"我喜欢吃{fruit}")

3. Jump statement
Jump statements are used to change the execution flow of the program. Jump statements in Python include break, continue and pass. .

1. break statement:
   The break statement is used to jump out of the current loop and interrupt the execution of the loop.

Sample code:

count = 0
while True:
    if count == 5:
        break
    print(f"当前数字是：{count}")
    count += 1

2. continue statement:
   The continue statement is used to skip the remaining code in the current loop and proceed directly to the next loop.

Sample code:

for i in range(10):
    if i % 2 == 0:
        continue
    print(f"当前数字是：{i}")

3. pass statement:
   The pass statement is used where a statement needs to exist grammatically, but does not need to execute any code.

Sample code:

def some_function():
    pass

Summary:
This article introduces commonly used flow control statements in Python, including conditional statements, loop statements and jump statements. Through these statements, we can control the execution flow of the program according to different conditions and achieve the functions we want. We hope that the code examples in this article can help readers better understand and master Python flow control statements so that they can be used flexibly in programming. At the same time, continuous practice and practice are also the keys to improving programming abilities. I hope readers can continue to learn and gradually improve their programming skills.

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