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python must memorize entry code

Oct 25, 2023 am 09:31 AM
python

Python is a simple and easy-to-learn programming language, suitable for beginners to get started. The following are some necessary Python entry codes to help you get started programming quickly:

1. Output Hello World

print("Hello World!")

2. Variables and data types

# 定义变量并赋值
name = "Alice"
age = 18
height = 1.65
is_student = True
# 打印变量
print(name)
print(age)
print(height)
print(is_student)
# 数据类型转换
age_str = str(age)
height_int = int(height)
is_student_str = str(is_student)

3. Input

# 输入字符串
name = input("请输入您的姓名:")
print("您的姓名是:", name)
# 输入数字
age = int(input("请输入您的年龄:"))
print("您的年龄是:", age)

4. Conditional judgment

age = int(input("请输入您的年龄:"))
if age >= 18:
print("您已经成年了!")
else:
print("您还未成年!")

5. Loop

# while循环
count = 0
while count < 5:
print("当前计数:", count)
count += 1
# for循环
for i in range(5):
print("当前计数:", i)

6. Lists and dictionaries

# 列表
fruits = [&#39;apple&#39;, &#39;banana&#39;, &#39;orange&#39;]
print(fruits[0]) # 输出apple
fruits.append(&#39;grape&#39;) # 添加元素
print(fruits) # 输出[&#39;apple&#39;, &#39;banana&#39;, &#39;orange&#39;, &#39;grape&#39;]
# 字典
person = {&#39;name&#39;: &#39;Alice&#39;, &#39;age&#39;: 18, &#39;gender&#39;: &#39;female&#39;}
print(person[&#39;name&#39;]) # 输出Alice
person[&#39;height&#39;] = 1.65 # 添加键值对
print(person) # 输出{&#39;name&#39;: &#39;Alice&#39;, &#39;age&#39;: 18, &#39;gender&#39;: &#39;female&#39;, &#39;height&#39;: 
1.65}

7. Functions

# 定义函数
def greet(name):
print("Hello,", name)
# 调用函数
greet("Alice")

8.Exception handling

try:
num = int(input("请输入一个数字:"))
result = 10 / num
print("结果:", result)
except ZeroDivisionError:
print("除数不能为0!")
except ValueError:
print("请输入一个有效的数字!")

The above are some examples of Python entry code, I hope it can help you start learning Python programming. If you have any questions, please feel free to ask.

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