以下是一些常用的 Python 代码和语句:

  1. 打印输出:
print("Hello, world!")
  1. 变量赋值:
x = 5
y = "John"
  1. 条件语句:
if x > 10:
  print("x is greater than 10")
elif x == 10:
  print("x is equal to 10")
else:
  print("x is less than 10")
  1. 循环语句:
for i in range(5):
  print(i)
  
while x < 10:
  print(x)
  x += 1
  1. 列表操作:
my_list = [1, 2, 3, 4, 5]
print(my_list[0]) # 输出 1
my_list.append(6) # 添加元素 6 到列表末尾
  1. 字典操作:
my_dict = {"name": "John", "age": 30, "city": "New York"}
print(my_dict["name"]) # 输出 "John"
my_dict["age"] = 31 # 修改键 "age" 对应的值为 31
  1. 函数定义:
def my_function(x, y):
  return x + y
  1. 导入模块:
import math

print(math.sqrt(4)) # 输出 2.0