一、Python基础入门代码10行
打印Hello World！
print("Hello World!")
定义变量并打印出来```
```python
name = "Alice"
print("My name is", name)
判断语句if-else`
age = 22
if age < 18:
print("You are too young.")
else:
print("Welcome!")
循环语句for
for i in range(5):
print("Number:", i)
列表List
fruits = ["apple", "banana", "cherry"]
print(fruits[1])
字典Dictionary
person = {
"name": "Alice", "age": 22, "gender": "female"}
print(person["age"])
函数Function
def add_numbers(x, y):
return x + y
result = add_numbers(3, 5)
print(result)
文件读写
file = open("example.txt", "w")
file.write("Hello World!")
file.close()
异常处理
try:
result = 10 / 0
print(result)
except ZeroDivisionError:
print("Cannot divide by zero.")
导入模块
import math
result = math.sqrt(16)
print(result)
二、Python菜鸟提升代码10行
Lambda函数
square = lambda x: x**2
print(square(4))
列表推导式
numbers = [1, 2, 3, 4, 5]
squares = [x**2 for x in numbers]
print(squares)
面向对象编程
class Person:
def __init__(self, name, age):
self.name = name
self.age = age
def greeting(self):
print("Hello, my name is", self.name)
person = Person("Alice", 22)
person.greeting()
装饰器Decorator
def uppercase_decorator(func):
def wrapper():
result = func()
return result.upper()
return wrapper
@uppercase_decorator
def greeting():
return "Hello World!"
print(greeting())
迭代器Iterator
numbers = [1, 2, 3, 4, 5]
iterator = iter(numbers)
print(next(iterator))
print(next(iterator))
生成器Generator
def fibonacci(n):
a, b = 0, 1
while a < n:
yield a
a, b = b, a + b
for number in fibonacci(10):
print(number)
静态方法staticmethod
class MyClass:
@staticmethod
def greeting():
print("Hello World!")
MyClass.greeting()
上下文管理器with语句
with open("example.txt", "r") as file:
for line in file:
print(line)
多线程Threading
import threading
def print_numbers():
for i in range(10):
print(i)
def print_letters():
for letter in ["a", "b", "c", "d", "e"]:
print(letter)
thread1 = threading.Thread(target=print_numbers)
thread2 = threading.Thread(target=print_letters)
thread1.start()
thread2.start()
正则表达式Regular Expression
import re
text = "The cat in the hat"
pattern = "cat"
result = re.findall(pattern, text)
print(result)
三、Python基础晋级代码10行
列表和字典的高级操作
fruits = ["apple", "banana", "cherry"]
fruit_dict = {
fruit: len(fruit) for fruit in fruits}
print(fruit_dict)
高级字符串操作
text = " Hello World! "
print(text.strip())
print(text.replace("World", "Universe"))
匿名函数和map操作
numbers = [1, 2, 3, 4, 5]
squares = list(map(lambda x: x**2, numbers))
print(squares)
列表排序和筛选
numbers = [5, 2, 7, 1, 9]
filtered = list(filter(lambda x: x < 6, numbers))
sorted_numbers = sorted(numbers)
print(filtered)
print(sorted_numbers)
文件读写的高级操作
with open("example.txt", "r") as file:
text = file.read()
lines = text.split("\n")
non_empty = list(filter(lambda x: x != "", lines))
print(non_empty)
时间和日期操作
import datetime
today = datetime.date.today()
print(today)
one_day = datetime.timedelta(days=1)
yesterday = today - one_day
print(yesterday)
面向对象的高级应用
class Person:
def __init__(self, name, age):
self._name = name
self._age = age
@property
def name(self):
return self._name
@property
def age(self):
return self._age
@age.setter
def age(self, value):
if isinstance(value, int) and value > 0:
self._age = value
else:
raise ValueError("Invalid age value.")
person = Person("Alice", 22)
print(person.name)
print(person.age)
person.age = 23
print(person.age)
列表解包和多重赋值
fruits = ["apple", "banana", "cherry"]
first, *rest = fruits
a, b, c = fruits
print(first)
print(rest)
print(a)
print(b)
print(c)
协程Coroutine
def coroutine():
while True:
x = yield
print("Received:", x)
coro = coroutine()
next(coro)
coro.send("Hello World!")
并发编程和多进程Multiprocessing
from multiprocessing import Process
def square(numbers):
result = [x**2 for x in numbers]
print(result)
numbers1 = [1, 2, 3, 4, 5]
numbers2 = [6, 7, 8, 9, 10]
process1 = Process(target=square, args=(numbers1,))
process2 = Process(target=square, args=(numbers2,))
process1.start()
process2.start()
process1.join()
process2.join()