python sytex a instance文法一例

python sytex a instance文法一例

#title:python sytex a instance#------------------------------#pathfilename:test.py#vp:hsg#create date:2011-10-20#------------------------------from __future__ import division#from __future__ import unicode_literals#note:not write china language word!print('Hello World')#set value to x,yx,y=1,2print xprint y#calute x(0~9) sum(x^2)print sum(x*x for x in range(10))#get substr methodstr = 'ABCDEFG'print str[0:3+0]#get substr method2nums=[1, 3, 5, 7, 8, 13, 20]print nums[2:5]   #[5,7,8]print nums[1:]    #[3, 5, 7, 8, 13, 20]print nums[:-3]   #[1, 3, 5, 7]print nums[:]     #[1, 3, 5, 7, 8, 13, 20]print nums[1:5:2] #[3,7]#str array foreach methodstrs=['a','b','c']for s in strs:    pass    print s#up this code have output value a b c#down this bottom code no value outputfor s in strs:    continue    print s#if check statementsage=18if age < 21:    print("you can't buy jiu")    print("but you can buy kou xiang tang")print("if out")#if elif  use methodx=1if x>0:        print("x>0")elif x<=0:        print("x<=0")    import mathprint "math.sin(math.pi/2)=1="print(math.sin(math.pi/2))    #define function method OKdef randint(a,b):    "return random integer in range[a,b],including both end points."    if  a>=0 and b>=a:        return (a+b)/2    else:        return -1#def endprint randint(1,5)print randint(-1,5)help(randint)#define function method 2 def reverse(str):    rstr=''    lstr=list(str)    for i in range(len(str),0,-1):        rstr +=''.join(lstr[i-1])    return rstrdef reverse2(str):    lstr=list(str)    lstr.reverse()    rstr=''.join(lstr)    return rstrdef reverse3(str):    return str[::-1]#call reverse function methodprint "----Fishhat---"print "reverse(string)"string="Fishhat"print list(string)print reverse(string)print "----ABCDE---"string="ABCDE"print reverse2(string)print reverse3(string)print "-------------"#class define and call methodclass Fish:    def eat(self,food):        if food is not None:            self.hungry=False        else:            self.hungry=True#class end   class User:    def __init__(myself,name):        myself.name=name#class end#use top code instance:f=Fish()#call class.methodFish.eat(f,"earchworm")print "earchworm"print f.hungryprint "-------------"f.eat(None)print "None="print f.hungryu=User("Tom talk hsg")print u.name   #requre from __futrue__ import division#only return  double numbersval=3/2print valprint "3/2=1.5="print(3/2)#array ->string method#return apple-banana-chinastring=('apple','banana','china')print '-'.join(string)print '-'.join("fishhat")#return f-i-s-h-h-a-tstring ='I am Fishhat'print stringprint "find rfind function"print string.find("F")print string.find("f")print string.find("h")print string.rfind('h')print "------------"str='AAAABBBBBDDDDD'print strprint str.replace('D','C')print str.replace('A','a',3)print "------------"#about time datetimeimport timestr=time.strftime('%Y-%m-%d %X',time.localtime())print strstr='2009/12/09'print type(str)str=time.strptime(str,'%Y/%m/%d')print strprint type(str)import datetimestr=datetime.datetime(2009,12,9)print strprint type(str)print "------------"#stopstr="s"#getc(stopstr)#import msvcrt,sysstop=raw_input("input Stop:")print stopimport getpasspwd=getpass.getpass('password:')print pwd#define console get password method  functionimport msvcrt, sysdef pwd_input():    chars = []    while True:        newChar = msvcrt.getch()        if newChar in '\r\n': # swap line            print ''            break        elif newChar == '\b': # back block            if chars:                del chars[-1]                sys.stdout.write('\b') #         else:            chars.append(newChar)            sys.stdout.write('*') # display * char    print ''.join(chars)pwd =pwd_input()print pwd#---the----end----

arcgis python 例子

用法1：求圖形面積運算式類型:PYTHON運算式   float(!shape.area!)用法2：求圖形長度運算式類型:PYTHON運算式  float(!shape.Length!)用法3：求兩欄位相乘運算式類型:PYTHON運算式  float(!kd!)*float(!cd!)用法3：自訂函數# Calculation is based on a custom getclass definition  expression = "getclass(float(!shape.area!))"  codeblock = "def getclass(area):               if area <= 1000:                    return 1               if area > 1000 and area <= 10000:                    return 2               else:                    return 3"  CalculateField(inputFC, "areaclass", expression, "PYTHON", codeblock)用法4:getclass(!dlmc!)def getclass(dlmc) :  if(dlmc=='灌溉水田') :    return "111"  if(dlmc=='菜地')  :       return "115"  if(dlmc=='其他園地')  :   return "125"  if(dlmc=='水澆地')  :     return "113"  if(dlmc=='果園')  :       return "121"  if(dlmc=='可調整果園')  :   return "121K"  if(dlmc=='可調整其他園地')  :   return "125K"  if(dlmc=='有林地')  :     return "131"  if(dlmc=='灌木林地')  :   return "132"  if(dlmc=='疏林地')  :     return "133"  if(dlmc=='曬穀場等用地')  :   return "158"  if(dlmc=='設施農業用地')  :   return "152"  if(dlmc=='畜禽飼養地')  :     return "151"  if(dlmc=='農村道路')  :       return "153"  if(dlmc=='可調整養殖水面')  :   return "155K"  if(dlmc=='養殖水面')  :         return "155"  if(dlmc=='農田水利用地')  :     return "156"  if(dlmc=='建制鎮')  :       return "202"  if(dlmc=='農村居民點')  :   return "203"  if(dlmc=='獨立工礦')  :     return "204"  if(dlmc=='公路用地')  :     return "262"  if(dlmc=='港口碼頭用地')  :   return "264"  if(dlmc=='水工建築用地')  :   return "272"  if(dlmc=='特殊用地')  :   return "206"  if(dlmc=='河流水面')  :   return "321"  if(dlmc=='灘涂')  :       return "324"  if(dlmc=='荒草地')  :     return "311"  else :      return "000"

取子字串方法在Arcgis中

!bhkbh![0:12+1] 取欄位bhkbh的前12位值

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