python sytex a instance语法一例

python sytex a instance语法一例

#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,y x,y=1,2 print x print y #calute x(0~9) sum(x^2) print sum(x*x for x in range(10)) #get substr method str = 'ABCDEFG' print str[0:3+0] #get substr method2 nums=[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 method strs=['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 output for s in strs: continue print s #if check statements age=18 if age < 21: print("you can't buy jiu") print("but you can buy kou xiang tang") print("if out") #if elif use method x=1 if x>0: print("x>0") elif x<=0: print("x<=0") import math print "math.sin(math.pi/2)=1=" print(math.sin(math.pi/2)) #define function method OK def 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 end print 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 rstr def reverse2(str): lstr=list(str) lstr.reverse() rstr=''.join(lstr) return rstr def reverse3(str): return str[::-1] #call reverse function method print "----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 method class 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.method Fish.eat(f,"earchworm") print "earchworm" print f.hungry print "-------------" f.eat(None) print "None=" print f.hungry u=User("Tom talk hsg") print u.name #requre from __futrue__ import division #only return double numbers val=3/2 print val print "3/2=1.5=" print(3/2) #array ->string method #return apple-banana-china string=('apple','banana','china') print '-'.join(string) print '-'.join("fishhat") #return f-i-s-h-h-a-t string ='I am Fishhat' print string print "find rfind function" print string.find("F") print string.find("f") print string.find("h") print string.rfind('h') print "------------" str='AAAABBBBBDDDDD' print str print str.replace('D','C') print str.replace('A','a',3) print "------------" #about time datetime import time str=time.strftime('%Y-%m-%d %X',time.localtime()) print str str='2009/12/09' print type(str) str=time.strptime(str,'%Y/%m/%d') print str print type(str) import datetime str=datetime.datetime(2009,12,9) print str print type(str) print "------------" #stopstr="s" #getc(stopstr) #import msvcrt,sys stop=raw_input("input Stop:") print stop import getpass pwd=getpass.getpass('password:') print pwd #define console get password method function import msvcrt, sys def 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：求图形面积 表达式类型:PYTHON 表达式 float(!shape.area!) 用法2：求图形长度 表达式类型:PYTHON 表达式 float(!shape.Length!) 用法3：求两字段相乘 表达式类型:PYTHON 表达式 float(!kd!)*float(!cd!) 用法3：自定义函数 # 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=='其他园地') : return "125" if(dlmc=='水浇地') : return "113" if(dlmc=='果园') : return "121" if(dlmc=='可调整果园') : return "121K" if(dlmc=='可调整其他园地') : 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=='晒谷场等用地') : return "158" if(dlmc=='设施农业用地') : return "152" if(dlmc=='畜禽饲养地') : return "151" if(dlmc=='农村道路') : return "153" if(dlmc=='可调整养殖水面') : return "155K" if(dlmc=='养殖水面') : return "155" if(dlmc=='农田水利用地') : return "156" if(dlmc=='建制镇') : return "202" if(dlmc=='农村居民点') : return "203" if(dlmc=='独立工矿') : return "204" if(dlmc=='公路用地') : return "262" if(dlmc=='港口码头用地') : return "264" if(dlmc=='水工建筑用地') : return "272" if(dlmc=='特殊用地') : return "206" if(dlmc=='河流水面') : return "321" if(dlmc=='滩涂') : return "324" if(dlmc=='荒草地') : return "311" else : return "000"
取子字符串方法在Arcgis中

!bhkbh![0:12+1] 取字段bhkbh的前12位值

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