python入門課程之基本lesson01

print 2.7 和 3.0 的區別是  2.0  ===> print "hello world"  3.0 ===>  print("hello world")

1 print("hello world") 

變數賦值  臨時存儲數據

name = '20'
age = 43
print(name,age)

輸入值用變數來存儲

#                      3.0 輸入是input("please input your text")
#                      2.X版本里有是raw_input("please input your text")
#                      2.7里  input() 括弧內輸入的是什麼就會給輸出什麼類型，然並卵，3.0去掉
#                     3.0里如果要用2.7里的input()  eq：eval(input("please input yous text"))

name = input("please your Nick name")
print(name)

if ... else ...  縮進 eq:  int(var):把var強轉成int

 luckNum = int(input("please input your luck number"))
         if luckNum == 1:
            print("i want say no")
         elif luckNum > 10:
            print("no come on baby")
         else:
             print("finally say yes")

while迴圈

inputNum = 0
bingoNum = 13
count = 0
while count < 3:
    inputNum = int(input("please input yours num:"))
    count = count+1
    if(count ==3):
        print("try too many ")
        break
    if(inputNum > bingoNum):
        print("input number is bigger!")
    elif(inputNum<bingoNum):
        print("input number is small!")
    elif(inputNum == 13):
        print("congratulation")
    break

字元串拼接   %s表占位   %s。。。賦值 %(val...)company = input("conpany:")

company = input("conpany:")
companyNum = input("number:")

print("info:\n company"+company+"\nnumber"+companyNum)   # “+”拼接字元串每加一次需要單獨的開闢一個記憶體
print("info｛｝ \n company: %s \n number: %s" % (company, companyNum))  #不會單獨的開闢一塊空間 節省記憶體

字元串方法

testString = "testsss1"

print(testString.lower()) #變小寫
print(testString.upper()) #變大寫
print(testString.split("g"))#用 “g” 去分割
print(testString.count("s"))#統計“s”的次數
print(testString.replace("1","2"))

列表 List的使用

nameList = ['jerry','tom','jeck','Alice']

print(nameList)
print(nameList[1]) 　　#取值

nameList.append("jerry")
print(nameList)  #尾部添加數據

print(nameList.index("jerry")) #找到jerry的索引值

print(nameList.count("jerry")) #統計list包含字元串的count

nameList.insert(0,"lulu")      #根據索引插入數據
print(nameList)

nameList.sort()
print(nameList)                 #按照ASKII碼去排序

nameList.reverse()              #反轉倒敘
print(nameList)

print(len(nameList))            # len（list）獲取list長度
print(dir(list))                #查看list有哪些方法可用

list進階

nameList = [1,2,4,'ok','yes']

print(nameList[0:2])   # 結果是 【1，2】        0 2代表索引
print(nameList[0:2:2]) # 表示可以從0~2的隔2個切一下

print(nameList[-3])    #取後面的倒著取

print(nameList[-2:])   #比如取出 ok 和 yes

print(range(10))         #range(0, 10)
print(type(range(10)))   #結果 <class 'range'>

if 4 in nameList:
    print("is true")     #判斷列表是是否包含某個值

元組

#yuanzu = (1,3,4,5,5,6,)  兩個方法  count和index  list和元組可以互相轉換

yuanzu = (1,3,4,5,5,6,)
list(yuanzu)
type(yuanzu)    #結果是 list
tuple(yuanzu)
type(yuanzu)    #結果是tuple

運算符

# 1.   ** 冪  2**3  2的三次方
# 2.  整除  1//2 =0  2//2=0  2.X里
# 3.  2.X里 <>不等於   3.X去掉
# 4. and java里並且的意思   or 或者  not 非真
# 5.Is 和Isnot  type(list) is list  結果 true

continue跳出本次迴圈，繼續下一次迴圈

 for i in range(10):
     if i > 3:
         continue
     print(i)

結果
 0
 1
 2
 3