python练习代码保存
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python练习代码保存
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#coding=utf-8
print('中國人')
"""
Python 保留字：and, exec, not, assert, finally, or, break, for, pass, class, from, print,
continue, global, raise, def, if, return, del, import, try, elif, in, while, else, is, with,
except, lambda, yield
"""
"""
:type
"""
counter = 100 #賦值整型變量
miles = 1000 #浮點(diǎn)型
name = "alan" #字符串
print(counter + miles)
a = b = c = 1
print(a)
str = "hello word!"
print(str * 2)#字符串輸出次數(shù)
print(str + "test") #輸出連接的字符串
print("str[:4]" + str[:4])
print("str[0:4]" + str[0:4])
print("str[:-1]" + str[:-1])
# print("str[-1:0]" + str[-6:-3])
tuple = ( 'runoob', 786 , 2.23, 'john', 70.2 )
tinytuple = (123, 'john')
print(tuple + tinytuple)
#tuple[2] = 1000 #元組是不允許更新的，而列表是允許更新的
'''
python中標(biāo)準(zhǔn)的數(shù)字類型有以下五種：
一.數(shù)字 Numberpython支持四種不同的數(shù)字類型：1.int 2.float 3.complex (復(fù)數(shù)：3 + 4j)
二.字符串 Stringstr = "hello word!"
三.列表 List：有序的對(duì)象集合list = [ 'a', 'b', 'c', 'd']
四.元組 Tuple:用()標(biāo)識(shí)，內(nèi)部元素用逗號(hào)隔開，但是元組不同二次賦值，相當(dāng)于只讀列表tuple = ( 'a', 'b', 'c')
五.字典
'''
print("-------------")
dict = {}
dict['one'] = 'this is one'
dict['two'] = 'this is two'
tinydict = {'name': 'alan','num': 6379, 'flag': 'true'}
print(dict['one'])
keys = tinydict.keys();
'''
注意：python輸出用逗號(hào)‘,’分隔，'+'表示的是字符串連接，會(huì)報(bào)類型轉(zhuǎn)換錯(cuò)誤
'''
for key in keys:print("->:", tinydict[key])
print("values: ",tinydict.values() )print("-------------")
a = 2
b = 3
c = a ** b # a 的 b 次冪
c1 = a * b
print("運(yùn)算: ", c)
print('%.3f' %(b/2)) #帶小數(shù)點(diǎn)
print(b/3) #取整除
x = 1
y = -1
print(x == y)
print("邏輯運(yùn)算符")
x = True
y = False
print(x and y)
print(x or y)
print(not x)
print("成員運(yùn)算符")
a = 1
myList = [1, 2, 3, 4]
print(a in myList) #x在序列中
b = -1
print(b not in myList) #b不在序列中
print("python 身份運(yùn)算符") #用于比較兩個(gè)對(duì)象的存儲(chǔ)單元 is or not is
a = 201
b = 20
print(id(a),"-",id(b)) #id函數(shù)，用來返回對(duì)象地址print("循環(huán)語句")
numbers = [1, 2, 3, 4]
even = []
odd = []
while len(numbers) > 0 :number = numbers.pop()print("number = ", number, " len = ", len(numbers))if(number % 2 == 0):even.append(number)else:odd.append(number)
print("奇數(shù): ", odd)
print("偶數(shù)：", even)
print("---------")
for letter in 'python':print("當(dāng)前字母： ", letter)
names = ['alan', 'dream', 'zuora']
for index in range(len(names)): #按照索引輸出print(names[index])
print("pass 語句") #pass 是空語句，為了保持程序結(jié)構(gòu)的完整性
for letter in 'python':if letter == 'h':passprint("這是 pass 塊")print("當(dāng)前字母: ", letter)
print("查看包中內(nèi)容")
import math
print(dir(math))
import cmath
print(dir(cmath))
print(cmath.pi)
print("字符串的內(nèi)建函數(shù)")
str = 'hello word'
str1 = 'word'
print(str.capitalize()) #首字母大寫
print(str.count(str1)) #str1在str中出現(xiàn)的次數(shù)
str = str.encode('gb2312') #編碼
print(str)
str = str.decode('gb2312') #解碼
print(str)
print("檢測(cè)字符串中是否包含子字符串")
print(str.find("word"))
print("文件IO")
# str = input("請(qǐng)輸入： ")
# print("內(nèi)容： " + str)
print("讀取文件")
file_name = "test.txt"
f = open(file_name, "r+", encoding= "utf-8")
# cnt = f.read()
# print(cnt)
# f.readline()#讀取一行
lines = f.readlines()
# print("lines: ", lines)
# for line in lines:
# print("一行行讀取: ", line)
# f.close()
# del f
print("寫入文件")
f = open(file_name, 'a+', encoding='utf-8')
f.writelines(lines)
f.close()
print("異常處理")
try:f = open(file_name, 'w', encoding='utf-8')f.write("這是一個(gè)測(cè)試文件，用于測(cè)試異常")
except IOError:print("Error: 沒有找到文件或讀取文件失敗")
else:print("寫入成功")
try:1 / 0
except ZeroDivisionError:print("除數(shù)不能為零")
#zip() 函數(shù)用于將可迭代的對(duì)象作為參數(shù)，將對(duì)象中對(duì)應(yīng)的元素打包成一個(gè)個(gè)元組，然后返回由這些元組組成的列表
my_list = [1, 'zuora', 3, 'alam']
my_list1 = [2, 'dream']
my_list2 = [3, 'alan']
zipped = zip(my_list, my_list1, my_list2)
for dict_ in zipped:print(dict_)
from People import People
p1 = People(1, 'alan')
p2 = People(2, 'dream')
p3 = People(3, 'zuora')
people_list = [p1, p2, p3]
zipped = zip(people_list)
for dict_ in zipped:print(dict_)
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