版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/yangliu19920502/article/details/53023854
做程序越久越发现语言只是一门工具而已,想要学习一门语言也很简单从语法开始半天到一天就差不多了(非系统级的语言)然后写下一些基本用法,这里贴出来:
main.py
"""一下是Python的常用模块"""
import sys
import os
import glob
import re
import mymodule
import math
import random
from urllib.request import urlopen
import smtplib
from datetime import datetime
import zlib # 还有gzip,bz2,zipfile,以及 tarfile
print("Hello Python")
print(True and True)
# 命令行参数
print(sys.argv)
# 错误输出重定向和程序终止
sys.stderr.write('Warning, log file not found starting a new one\n')
# 获得当前工作的目录
print(os.getcwd())
# 文件通配符
print(glob.glob('*.py'))
# 字符串正则匹配
print(re.findall(r'\bf[a-z]*', 'which foot or hand fell fastest'))
print(re.sub(r'(\b[a-z]+) \1', r'\1', 'cat in the the hat'))
# 数学
print(math.cos(math.pi / 4))
print(math.log(1024, 10))
# 随机数
print(random.random())
print(random.sample(range(100), 10))
print(random.choice(['apple', 'pear', 'banana']))
# 网络
for k in urlopen("http://www.baidu.com"):
print(k.decode("UTF-8"))
# 日期处理
print(datetime.today())
print(datetime.today().strftime("%m-%d-%y. %d %b %Y is a %A on the %d day of %B."))
# 数据压缩,b为了能够使用Python2的库
sss = b"witch which has which witches wrist watch"
t = zlib.compress(sss)
print(len(t))
print(zlib.decompress(t))
arrs = [1, 2, 3]
del arrs[0]
print(arrs)
print(len(arrs))
attr_1 = ['h', 'e', 'l', 'l', 'o']
attr_2 = ['w', 'o', 'r', 'l', 'd']
print(attr_1 + attr_2)
for i in attr_1:
print(i)
j = 0
while j < len(attr_1):
print(j, attr_1[j])
j += 1
iterator = iter(attr_2)
while True:
try:
print(next(iterator))
except StopIteration:
break
def hello_function():
print("Hello Python!")
hello_function()
def print_a_string(string):
print(string)
string = "i edit it"
return string
print(print_a_string("call a function"))
print("Python path:", sys.path, '\n')
print(mymodule.getNumber(20, 78))
moduleClass = mymodule.MyClassImpl("哈哈哈")
print(moduleClass.i, moduleClass.getSomeNumber(), moduleClass.getSomeString(),
moduleClass.getYourInput("input1", "input2"), moduleClass.getPrivateNumber())
sys.exit(0)
str1 = input("请输入一个数字1:")
str2 = input("请输入一个数字2:")
try:
print(int(str1) + int(str2, 0))
except (ValueError, RuntimeError):
print("输入的不是数字:", ValueError)
try:
print(int(str1))
except ValueError:
"""这个什么都不做"""
pass
"""-----------------------"""
"""自定义一个Exception"""
class MyException(Exception):
def __init__(self):
pass
try:
raise MyException()
except MyException:
print(MyException)
try:
print(int(str1))
except ValueError:
"""这个就是把错误又抛出去了"""
raise
else:
print("如果你没有把握抛出的是ValueError那么这儿会给你一次拦截的机会")
finally:
print("一样的支持finally")
mymodule.py
# Filename:mymodule.py
def getNumber(n1, n2):
return n1 * n2
class MyClass:
"""这个是私有变量"""
i = 0
j = 2
"""这个是私有的变量外部无法访问"""
__privateValue = 1234
def __init__(self):
print("这个是无参构造函数")
def __init__(self, str):
print("这个是有参构造函数:", str)
def getSomeString(self):
return "Hello Python Class!!!"
def getSomeNumber(self):
return self.i + self.j
def getYourInput(self, str1, str2):
return str1 + str2
def getPrivateNumber(self):
return self.__privateValue
class OtherClass:
def __init__(self):
print("多继承的类")
class MyClassImpl(MyClass, OtherClass):
i = 10
def __init__(self, s):
print("这个是继承类")
MyClass.__init__(self, s)
OtherClass.__init__(self)
def getSomeString(self):
return "覆盖了父类"