我理解除第一个以外的所有功能.什么(*args)是什么意思？
谢谢
def print_twice(*args):
arg1, arg2 = args
print 'arg1: %r arg2: %r' % (arg1, arg2)
def print_twice_again(arg1, arg2):
print 'arg1: %r arg2: %r' % (arg1, arg2)
def print_once(arg1):
print 'arg1: %r' % arg1
def print_none():
print 'i got nothin...'
print_twice("neil", "harper")
print_twice_again("neil", "harper")
print_once("first!")
print_none()
(defun dump-db ()
(dolist (cd *db*)
(format t "~{~a:~10t~a~%~}~%" cd)))
它dolist使*db*变量对应的列表的每个元素cd？
并且~a意味着以更易读的形式打印它,但这两个让我感到困惑.
~{ ~}这是否意味着中间的任何内容*db*将被格式化为每个元素的方式？
什么是:中~{~a:？
出于某种原因,当游戏到达黄金房间时,它无法正常工作.当我输入任何数字我得到死亡信息'男人,学会输入一个数字'
谢谢
from sys import exit
def gold_room():
print 'this room is full of gold, how much do you take?'
next = raw_input('> ')
if '0' in next or '1' in next:
how_much = int(next)
else:
dead('man, learn how to type a number')
if how_much < 50:
print 'nice! your not too greedy. you win!'
exit(0)
else:
dead('you greedy bastard!')
def bear_room():
print 'there is a bear here.'
print 'the bear has a bunch of honey'
print 'the fat bear …嘿家伙,我无法理解这一点,当地图被真正引用到城市字典时,我得不到.或者最后一行,(城市,州)部分是什么？
谢谢.
cities = { 'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}
cities['NY'] = 'New York'
cities['OR'] = 'Portland'
def find_city(themap, state):
if state in themap:
return themap[state]
else:
return 'not found'
#ok pay attention!
cities['_find'] = find_city
while True:
print 'State? (ENTER to quit)'
state = raw_input('> ')
if not state: break
#this line is the most important ever! study!
city_found = cities['_find'] (cities, state)
print city_found
(or (parse-integer (prompt-read "Rating") :junk-allowed t) 0)
这条线让我很困惑.如果你需要它,完整的程序就在这里:http://paste.lisp.org/display/124929
'Parse-integer'会将字符串转换成整数吗？如果可能的话.并且':junk-allowed t'让它以某种方式接受垃圾串吗？
不知道最后的'或'和0是什么.
谢谢.