打印输出:

pythonCopy code

print("Hello, world!")

变量赋值:

pythonCopy code

x = 10

基本数学运算:

pythonCopy code

addition = 5 + 5 subtraction = 10 - 5 multiplication = 4 * 3 division = 8 / 2 modulus = 7 % 3 exponentiation = 2 ** 3

字符串拼接:

pythonCopy code

greeting = "Hello" + " " + "World!"

列表创建:

pythonCopy code

my_list = [1, 2, 3, 4, 5]

列表添加元素:

pythonCopy code

my_list.append(6)

列表访问元素:

pythonCopy code

first_element = my_list[0]

列表切片:

pythonCopy code

sublist = my_list[1:3]

循环遍历列表:

pythonCopy code

for item in my_list: print(item)

条件语句:

pythonCopy code

if x > 5: print("x is greater than 5") elif x == 5: print("x is 5") else: print("x is less than 5")

字典创建和访问:

pythonCopy code

my_dict = {"name": "John", "age": 30} name = my_dict["name"]

字典添加或修改元素:

pythonCopy code

my_dict["city"] = "New York"

字典中的循环:

pythonCopy code

for key, value in my_dict.items(): print(f"{key}: {value}")

使用range函数:

pythonCopy code

for i in range(5): print(i)

列表推导式:

pythonCopy code

squares = [x**2 for x in range(10)]

函数定义和调用:

pythonCopy code

def greet(name): return f"Hello, {name}!" greeting = greet("Alice")

使用*args和kwargs**:

pythonCopy code

def function_with_args(*args, **kwargs): print(args) print(kwargs) function_with_args(1, 2, 3, key1="value1", key2="value2")

类定义和实例化:

pythonCopy code

class MyClass: def __init__(self, name): self.name = name def greet(self): return f"Hello, {self.name}!" my_object = MyClass("Bob") print(my_object.greet())

文件读写:

pythonCopy code

# 写入文件 with open("myfile.txt", "w") as file: file.write("Hello, file world!") # 读取文件 with open("myfile.txt", "r") as file: content = file.read() print(content)

错误和异常处理:

pythonCopy code

try: result = 10 / 0 except ZeroDivisionError: print("Divided by zero!") finally: print("This code block is always executed")

使用enumerate:

pythonCopy code

for index, value in enumerate(["a", "b", "c"]): print(index, value)

集合创建和操作:

pythonCopy code

my_set = {1, 2, 3} my_set.add(4) my_set.remove(2)

集合运算:

pythonCopy code

set_a = {1, 2, 3} set_b = {