python學習筆記2

建立一個檔案並往裡面寫入內容

import os# coding='utf-8'#取得OS的分行符號ls = os.linesep# 擷取檔案名稱while True:    fname = raw_input('input file name: ')    if os.path.exists(fname):        print "ERROR : '%s' already exists!" % fname    else:        breakprint fname#擷取檔案的內容all = []print "\nEnter lines('.' by iteslf to quit).\n"#讀取使用者的輸入while True:    entry = raw_input('> ')    if entry == '.':        break    else:        all.append(entry)#寫入檔案fobj = open(fname,'w')fobj.writelines(['%s%s' % (x, ls ) for x in all])fobj.close()print "DONE"

讀取檔案內容並顯示出來

# coding='utf-8'# 擷取檔案名稱fname = raw_input('input file name: ')print fnametry:    fobj = open(fname,'r')except IOError, e:    print "**** file open: ",eelse:    for eachLine in fobj:        print eachLine,    fobj.close();

擷取數值的類型.注意python作為進階語言,卻沒有對數值進行統一,還是分屬於幾個類型:整型,浮點型,長整型,複數

# coding='utf-8'# 擷取數值的類型def getNumType(num):    print num, 'is',    #判定參數一是否為參數二當中的某個元素的執行個體    if isinstance(num, (int,long,float,complex)):        print 'a number of type: ',type(num).__name__    else:        print 'not a number at all'        getNumType(-68)getNumType(99999999999999999999999999999L)getNumType(98.6)getNumType(-5.2+1.9j)getNumType("1212")