examples of python & pyqgis code snippets

examples of python & pyqgis code snippets

pyqgis/intro_python.py

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+# -*- coding: utf-8 -*-
+"""
+# The Python Tutorial
+# https://wikidocs.net/book/1
+# http://docs.python.org/2/tutorial/index.html
+"""
+
+#===================================
+# 모듈 참조
+#===================================
+from 모듈이름 import 모듈함수
+
+# PyQt
+from PyQt4.QtCore import *
+from PyQt4.QtGui import *
+
+# QGIS
+from qgis.core import *
+from qgis.gui import *
+
+# 경로 등 내장 함수
+from glob import glob
+from os import path
+
+#===================================
+# 자료형
+#===================================
+# string 
+say = "Python is very easy."
+print say[2]
+print say[:6]
+
+print '한글'
+print u'한글'
+
+# number
+a = 3   # int
+b = 4   # int
+print a / b
+print float(a) / b
+
+print say + ' ' + str(a)
+print say[4] * 20
+
+# list
+list = [1,3,5,7,9]
+print len(list)
+if 3 in list:
+    print 'exist'
+else:
+    print 'not exist'
+
+#===================================
+# 제어문
+#===================================
+# java for loop
+# for (int i = 0; i < 10; i++) {
+#     System.out.println(i);
+# }
+
+# for
+for i in list:
+    print i,
+
+for i in range(10):
+    print i
+
+for i in range(2, 10):
+    print i
+
+for i in range(10, -1, -1):
+    print i,
+
+# while
+treeHit = 0
+while 1:
+    treeHit = treeHit + 1
+    if treeHit == 10:
+        print "last 10"
+        break
+    elif treeHit == 1:
+        print "first 1"
+    else:
+        print treeHit
+
+#===================================
+# Function & Class
+#===================================
+# function
+def sum(a, b): 
+    return a + b
+
+print sum(3, 4)
+
+# function
+def sum_and_mul(a, b): 
+    return (a + b, a * b)
+
+print sum_and_mul(3, 4)
+(s, m) = sum_and_mul(3, 4)
+
+# class
+class Person:
+    def __init__(self, name):
+        self.name = name
+
+    def greet(self):
+        print 'Hello ' + self.name
+
+    @staticmethod
+    def static_greet(name):
+        print 'Hello ' + name
+
+pp = Person('QGIS')
+pp.greet()
+Person.static_greet('QGIS')
+
+#===================================
+# 기타
+#===================================
+# math
+import math
+
+print math.pi
+print math.pow(2, 3)
+
+# system
+import sys
+sys.path.append("C:\OpenGeoSuite\pyqgis") 
+
+# lambda
+# lambda = 인수1, 인수2, ...  : 인수를 이용한 표현식
+sum = lambda a, b: a+b 
+sum(3,4)