python基础学习

hello world：

message_1 = "hello python"message_2 ="world!"num=2333 #no chinese  this is zhu shi#no chinesemessage_full=message_1+" "+message_2+str(num)print(message_full.title())

list：

EDG=['meiko','scout','zet',"deft"]print(EDG)del EDG[3]print(EDG)EDG.append("mouse")print(EDG)EDG.insert(1,"clearlove")print(EDG)print(EDG[0].title())print(EDG[-1].title())message="i think "+EDG[0]+" is the best sup."print(message.title())EDG.sort()print(EDG)print(len(EDG))

for:

sups=["meiko","five","mata","ming"]for sup in sups:   print(sup+" is god")print("But i think meiko is the best")for value in range(1,5):   print(value)numbers=list(range(1,10,2))print(numbers)squares=[value**3 for value in range(1,11)]print(squares[0:4])

if:

car="Bmw"if car.lower() == "bmw":    print("true")else:    print("false")print(car=="bmw")

else if:

users=["admin","rsin","zhjf","7520"]if users:    for user in users:        if user=="admin":            print("Hello admin,would you like to see a status report?")        else:            print("Hello Eric,think you for logging in again.")else:    print("there is no user")

zidain:

friend ={"name":"chenqiyu","nikename":"xiaoyu","age":20,"city":"beijing"}print(friend)print("not beijing,he is in nanjing")friend["city"]="nanjing"friend["class"]=10print(friend)del friend["class"]print(friend)print(friend["name"]+"("+friend["nikename"]+")"+" in "+friend["city"]+" is "+str(friend["age"])+" years old.")print("*****************************************")for key,value in friend.items():    if key!="age":        print(key+":"+value)    else:        print(key+":"+str(value))print("*****************************************")for key in friend.keys():    print(key)print("*****************************************")for value in friend.values():    print(value)print("*****************************************")alien_0={'color':'green','points':5}alien_1={'color':'yellow','points':10}alien_2={'color':'red','points':15}aliens=[alien_0,alien_1,alien_2]for alien in aliens:    print(alien)

input:

age=input("plz input your age but not in 18~50:")age=int(age)while age>=18 and age<=50:    age=input("plz input your age but not in 18~50:")    age=int(age)if age<18:    print("you are young")elif age>50:    print("you are old")number=0while number<10:    number+=1    if number%2 == 1:        continue    print(number)

function:

def sayhello():    """show hello"""    print("hello")def toyou(name="???"):    """say hello to you"""    print("hello "+name)def make_shirt(cm,cha="rsin"):    print("the shirt with "+cha+" is "+str(cm))def get_plus(a,b):    c=a+b    return cdef get_users(names):    for name in names:        msg="hello, "+name.title()+"!"        print(msg)usernames=["hannah","ty","margot"]get_users(usernames)sayhello()name=input("plz input your name:")toyou(name)cm=input("plz input your cm:")cm=int(cm)make_shirt(cm,name)a=input("plz input a:")a=int(a)b=input("plz input b:")b=int(b)c=get_plus(a,b)print(str(c))

class:

class dog():    def __init__(self,name,age):        self.name=name        self.age=age    def sit(self):        print(self.name.title()+" is sitting now")    def roll_over(self):        print(self.name.title()+" is rolled now")class cutedog(dog):    def __init__(self,name,age):        super().__init__(name,age)my_dog=cutedog('wufan',2)print(my_dog.name.title())print(str(my_dog.age))my_dog.sit()my_dog.roll_over()

file:

with open('D:\pi_digits.txt') as file_object:    contents=file_object.read()    print(contents)print("*******************")with open('D:\pi_digits.txt') as file_object:    for line in file_object:        print(line.rstrip())print("*******************")with open("D:\pi_digits.txt") as file_object:    lines=file_object.readlines()pi_string=''for line in lines:    pi_string+=line.strip()print(pi_string)with open('ok.txt','a') as file_obj:    file_obj.write("hello boys")

dump:

import jsonnumbers=[2,3,5,7,11,13]filename='numbers.json'with open(filename,'w') as f_obj:    json.dump(numbers,f_obj)