python2.7和3.7的區別

區別一:print語法使用

Python2.7   print語法使用   >>> ; print "Hello Python"       

Python3.7   print語法使用   >>> print("Hello Python")

範例:在Pyt機制  提示Did you mean print("Hello Python3.7")  

 print 換行與不換行區別

## python  2.7  print不換行使用","即可

 python 3.7 print 不換行使用end=""

差異二: raw_input()和input()

 Python 2.7  raw_input()  input() 都存在可用    raw_input()接收字串string  input()接收數字/flot.##int/flot.

 Python 3.7  raw_input()不存在  只存在input()   兩者合併  接收任意格式回傳string

######################################################################################################## #### ###區別三: 函數cmp()#########python 2.7   cmp(x,y)函數用於比較2個對象，如果x < y 返回-1, 如果x == y 回傳0, 如果x > y 回傳1######python3.7    cmp()已經不存在了,如果你需要實作比較功能，需要引入operator 模組，適合任何物件###

<span class="pun">>>><span class="pln"> <span class="kwd">import<span class="pln"> <span class="kwd">operator<br/><span class="pln"><span class="pun">>>><span class="pln"> <span class="kwd">operator<span class="pun">.<span class="pln">eq<span class="pun">(<span class="str">&#39;hello&#39;<span class="pun">,<span class="pln"> <span class="str">&#39;name&#39;<span class="pun">);<br/><span class="pln"><span class="kwd">False<br/><span class="pln"><span class="pun">>>><span class="pln"> <span class="kwd">operator<span class="pun">.<span class="pln">eq<span class="pun">(<span class="str">&#39;hello&#39;<span class="pun">,<span class="pln"> <span class="str">&#39;hello&#39;<span class="pun">);<br/><span class="pln"><span class="kwd">True<br/></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

# #####區別四:string 字母大小寫字串#########string.letters:包含所有字母（大寫或小寫）的字串######Python 3.0中，string. ascii_letters.######相關推薦：《###Python教學###》###

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