python学习笔记之基础数据和控制

注释：

单行注释 #

多行注释'''    '''

注意：当注释中有汉字时需要在python文件的第一行添加如下内容之一：#coding:gbk或#coding:utf-8或##-*- coding : gbk -*-

hello world python:

#coding:utf-8
'''
Created on 2014-6-6

@author: yzl
'''

print '----------基础类型的操作----------'
i = 10
print i
i = i+10
print i
print i*2

if i==20:
    print 'i==',i
    
str = 'string '
print str*2

bool = True or False
print bool

s='this is test string 
hello world python'
print s

l='''thi is test string
test to print hello world python'''
print l

print '---------控制语句---------'

# wait user input
num = int(raw_input('Enter an integer :'))
if num<10:
    print 'this number is < 10'
elif num>=10 and num<=100:
    print 'this number is bettween 10 and 100'
else:
    print 'yeah! the num is:',num
for j in range(1,num):
    if j<5:
        continue
    if j>=10:
        break
    print 'for run :',j

step = 0 
while bool:
    if num<100:
        step = step +1
        print 'case 1,step is:',step
        if step > 10:
            break
    elif num>=100:
        bool = False
        print 'case 2 to stop while'
# 当bool为false时执行
else:
    print 'go to else case'
        

运行结果：

----------基础类型的操作----------
10
20
40
i== 20
string string 
True
this is test string hello world python
thi is test string
test to print hello world python
---------控制语句---------
Enter an integer :200
yeah! the num is: 200
for run : 5
for run : 6
for run : 7
for run : 8
for run : 9
case 2 to stop while
go to else case


Enter an integer :30
this number is bettween 10 and 100
for run : 5
for run : 6
for run : 7
for run : 8
for run : 9
case 1,step is: 1
case 1,step is: 2
case 1,step is: 3
case 1,step is: 4
case 1,step is: 5
case 1,step is: 6
case 1,step is: 7
case 1,step is: 8
case 1,step is: 9
case 1,step is: 10
case 1,step is: 11