Python 初次接触 （1）

1、安装好python

写第一条语句：

print 'hello world'

' ' 和 " " 一样的，都可以输出

2、pip install numpy

3、尝试输出 

(x,y,z) = (1,2,"hello")
print "x=%d" % x
print "y=%d" % y
print "z=",z

4、列表List

classmates = ['Java','Ruby','Python'];
print classmates[1]
print len(classmates)
print classmates
classmates.insert(1,"C#")
print classmates
classmates.append("JavaScript")
print classmates
classmates.pop(2)
print classmates
classmates.pop()
print classmates
classmates[1] = "Ruby"
print classmates