What are the necessary codes for python?

Python is a general-purpose programming language that can be used for a variety of development tasks. The following are some necessary Python code examples that cover basic Python programming concepts, such as variables, data types, operators, functions, conditional statements, etc.:

1. Variables and data types:

# 定义变量并赋值
x = 10
y = "Hello, World!"
# 打印变量值
print(x)
print(y)
# 定义不同类型的变量
a = 5 # 整型
b = 3.14 # 浮点型
c = True # 布尔型
d = [1, 2, 3] # 列表型
# 打印变量类型
print(type(a))
print(type(b))
print(type(c))
print(type(d))

2. Operator:

# 算术运算符
a = 10
b = 3
print(a + b) # 加法
print(a - b) # 减法
print(a * b) # 乘法
print(a / b) # 除法
# 比较运算符
a = 10
b = 3
print(a > b) # 大于
print(a < b) # 小于
print(a == b) # 等于
print(a != b) # 不等于
# 逻辑运算符
a = True
b = False
print(a and b) # 与
print(a or b) # 或
print(not a) # 非

3. Conditional statement:

# if 语句
a = 10
if a > 5:
print("a 大于 5")
elif a == 5:
print("a 等于 5")
else:
print("a 小于 5")
# if-elif-else 语句
x = 10
if x > 0:
print("x 是正数")
elif x == 0:
print("x 是零")
else:
print("x 是负数")
# switch 语句
x = 10
switch = {
1: "一",
2: "二",
3: "三",
4: "四",
5: "五"
}
print(switch.get(x))

4. Loop statement:

# for 循环
fruits = ["apple", "banana", "cherry"]
for i in fruits:
print(i)
# while 循环
i = 0
while i < 5:
print(i)
i += 1
# break 和 continue
for i in range(10):
if i == 5:
break
print(i)
if i % 2 == 0:
continue
print(i)

5, function:

# 定义函数
def hello():
print("Hello, World!")
# 调用函数
hello()

These sample codes cover the basic concepts of Python programming and can help you quickly get started with Python programming. Of course, Python programming also has many advanced functions and modules, such as multi-threading, network programming, database operations, etc. You can gradually learn and master these functions according to your needs and interests. print(“Hello, World!”)

6. Call function

hello()

These sample codes cover the basic concepts of Python programming and can help you quickly get started with Python programming. . Of course, Python Programming also has many advanced functions and modules, such as multi-threading, network programming, database operations, etc. You can gradually learn and master these functions according to your needs and interests.

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