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python学习 第一篇 基础
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上周報(bào)名了reboot python 課程，終于下決心要把python 搞好了，希望自己能堅(jiān)持下來(lái)，并得到自己想要的成績(jī)
#coding:utf-8
#呵呵
#print?'hello?world'
#x='hello?world'
#print?x
#x=raw_input('hello?world')
#print?x
#int
#print?2+3
#print?1+2*3
#print?8/3
#print?8/3.0
#print?8%3
#str??單雙引號(hào)無(wú)卻別
print?'hello?world'
print?"hello?world"
print?"I'am?pythoner"
print?'I\'am?pythoner'
#三個(gè)單引號(hào)?起聲明作用
print?'''
this?
is?
atest
'''
#字符串拼接
print?'hello?'+'reboot'
print?'hello?'*2
#字符串格式化
#數(shù)字(0,?1,?...)即代表format()里面的元素,?所以可以使用"."調(diào)用元素的方法;
x='fujinzhou'
y=22
h='good'
print?'Hi?%s?I?am?%d?years?old?,You?are?very?%s'%(x,y,h)
print?'Hi?'+?x?+',You?are?very?'+?h?+''?
print?('Hi?{0}?I?am?{1}?years?old,You?are?very?{2}!'.format(x,y,h))
#布爾值?True?False??與或非?
#and
#兩邊都是真，才是真
#print?True?and?True
#print?2>3?and?3>2
#or?或?,兩種情況只要有一種情況
#print?True?or?False
#not?非
#print?not?False
#print?not?True
#流程控制
#if?True?or?False:
#????是True?就執(zhí)行這段代碼
if?2<3?or?5<4:
print?'condition?is?True'
else:
print?'condition?is?False'
name='reboot'
age=20
if?name=='reboot':
if?age>10:
print?'you?are?%s?years?old'%(age)
print?'condition?is?reboot'
else:
print?'condition?is?False'
#while?循環(huán)
#while?情況1：
#里面的代碼會(huì)一直執(zhí)行，直到情況1是false
#i=0
#while?i<20:
#print?i
#i+=1
#print?'while?is?end'
#用戶一直輸入數(shù)字，當(dāng)輸入0時(shí)。終止并輸出數(shù)字之和
count=0
while?True:i=int(raw_input('please?inut?your?number:'))count?+=iif?i==0:print?countbreak;
count=0
y=raw_input('please?input?a?number')
while?int(y)!=0:count?=count+int(y)y=raw_input('please?input?a?number')
print?'the?total?is?%d'%(count)
#用戶一直輸入數(shù)字，當(dāng)輸入為空時(shí)。終止并輸出平均值
count=0
total=0
y=raw_input('please?input?a?number')
while?y:count?=count+int(y)y=raw_input('please?input?a?numbers:')total+=1
print?'the?total?is?%s'%(count/total)
#for?循環(huán)?專門針對(duì)list?dict等結(jié)構(gòu)
#arr=['1','2','three']
#for?i?in?arr:
#??print?i
#找出列表中js出現(xiàn)的次數(shù)
#num=0
#list1=['c','python','js','node','java','js','ruby']
#for?i?in?list1:
#if?i?=='js':
#????????????num+=1
#print?num
#numlist=[1,2,3,2,12,3,1,3,21,2,2,3,4111,22,3333,444,111,4,5,777,65555,45,33,45]
#max1=0
#max2=0
#for?i?in?numlist:
#if?max1<i:
#max1=i
#for?i?in?numlist:
#if?max1==i:
#continue
#if?max2<i:
#max2=i
#print?max1,max2
#i=0
#while?True:
#if?i?>10:
#break
#print?i
#i+=1
#arr=['c','python','js','node']
#for?i?in?arr:
#if?i=='js':
#continue
#print?i
#d?={'name':'reboot','age':50}
#print?d['name']?#根據(jù)key?獲取?value
#d['age']=50??#修改值
#print?d
#d['newkey']='key1'?#增加新值
#print?d
#total=0
b={}
a=['C','js','python','js','css','js','html','node','js','python','js','css','js','html','node','js','python','js','css','js']
for?i?in?a:
if?i?in?b:
b[i]+=b[i]+1
else:
b[i]=1
print?b
小練習(xí)
#coding:utf-8
#用戶輸入名字和分?jǐn)?shù)，并保存到list。如果輸入為空，打印并結(jié)束循環(huán)。并算出平均值
list1=[]
count=0
num=0
while?True:x=raw_input('please?input?your?name:')y=raw_input('please?input?your?grade:')if?y.isdigit()?and?x.isalpha():list1.append(int(y))list1.append(str(x))count+=1num=int(num)+int(y)elif?len(x)==0?or?len(y)==0:avg=num/countprint?list1breakelse:print?'input?is?error'
print?'平均值是?%s'?%(avg)
轉(zhuǎn)載于:https://blog.51cto.com/thedream/1812654
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