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
view plain
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
---the end----
摘自:hsg77的专栏
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