Python/基础
外观
< Python
首先,使用Python要先从Python网站下载。此教程使用2.5版本。下载网址:
Python在英文中是蟒蛇的意思。Python的创始人为荷兰的Guido van Rossum。他在1989年为了打发圣诞节的无趣,决定开发一个新的脚本解释程序,名称以他爱看的一个电视喜剧的名字来命名。(在维基百科详细了解)
在IDLE裡输入print "Hello World"
来显示第一个脚本。
>>> print "hello world"
hello world
字符串
[编辑]字符串的引号有以下几种写:
- “
'
”或“"
”,可以指示这里的字符是字符串 - “
"""
”或“'''
”——三个引号,引用多行字符串 - “
\n
”——转义符,表示换行 - 在“
'
”或“"
”的行末输入“\
”转行
>>> abc='def'
>>> abc="def"
>>> abc='''d
ef'''
>>> abc="d\
ef"
语句间的间隔
[编辑]有两种方式间隔:
- 换行
- “
;
”——分号
>>> abc="def"
>>> wmr="great wikipedian"
>>> abc="def";wmr="great wikipedian"
控制语句
[编辑]if
:如果,(wmr could be admin on wikipedia)elif
:另一个如果,(wmr could be bureaucrat on wikipedia)else
:如果两个都不,(wmr could be nothing on wikipedia)
>>> wmr=250
>>> if wmr==500:
print "wmr could be admin on wikipedia."
elif wmr==1000:
print "wmr could be bureaucrat on wikipedia."
else:
print "wmr could be nothing on wikipedia."
wmr could be nothing on wikipedia.
while
:与此同时..
>>> while running=True
>>> while running:
wmr=250
if wmr==500:
print "wmr could be admin on wikipedia."
elif wmr==1000:
print "wmr could be bureaucrat on wikipedia."
else:
print "wmr could be nothing on wikipedia."
running = False
一定要写running = False !否则就会一直print "wmr could be nothing on wikipedia."
- for:循环
for i in range(1, 5):
print i
else:
print 'The for loop is over'
- break:终止循环
>>> while running=True
>>> while running:
wmr=250
if wmr==500:
print "wmr could be admin on wikipedia."
elif wmr==1000:
print "wmr could be bureaucrat on wikipedia."
else:
print "wmr could be nothing on wikipedia."
break