《python核心编程第二版》第2章习题

2-1 略

2-1 略

2-2

（a）打印 结果是9

（b）9

（c）一样

（d）略

（e）略

2-3 略

2-4 （a）

# /usr/bin/python
raw_input()

(b)

# /usr/bin/python
str1 = raw_input()
print int(str1)

2-5

(a)

# /usr/bin/python
i=1
while i < 11:
    print i
    i = i+1

(b)

# /usr/bin/python
for i in range(1,11):
    print i

2-6

# /usr/bin/python
# coding:utf8
num = raw_input()
if num >0:
    print "正数"
elif num <0:
    print "负数"
else:
    print "0"

2-7

# /usr/bin/python
# coding:utf8
flag = 1

while flag != '0':
    flag = raw_input()
    print flag

2-8

# /usr/bin/python
# coding:utf8
list1 = [1,2,9,3,4]
print sum(list1)

for i in range(0,5):
    list1[i] = int(raw_input())
print sum(list1)

2-9

# /usr/bin/python
# coding:utf8
list1 = [1,2,9,3,4]
print float(sum(list1))/5

2-10

# /usr/bin/python
# coding:utf8
flag =1
while flag!=0:
    i = int(raw_input())
    if i>1 and i <100:
        flag = 0
    else:
        print "重新输入"

2-11

# /usr/bin/python
# coding:utf8
i = '1'
while i!='X':
    list1 = [1,3,4,5,7]
    i =  raw_input()
    if i == '1':
        print sum(list1)
    elif i == '2':
        print float(sum(list1))/5

2-12

(a)['__builtins__', '__doc__', '__file__', '__name__', '__package__']

(b)<built-in function dir>

(c)报错

(d)略

2-13

(a)['__displayhook__', '__doc__', '__egginsert', '__excepthook__', '__name__', '__package__', '__plen', '__stderr__', '__stdin__', '__stdout__', '_clear_type_cache', '_current_frames', '_getframe', '_mercurial', 'api_version', 'argv', 'builtin_module_names', 'byteorder', 'call_tracing', 'callstats', 'copyright', 'displayhook', 'dont_write_bytecode', 'exc_clear', 'exc_info', 'exc_type', 'excepthook', 'exec_prefix', 'executable', 'exit', 'flags', 'float_info', 'float_repr_style', 'getcheckinterval', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencoding', 'getprofile', 'getrecursionlimit', 'getrefcount', 'getsizeof', 'gettrace', 'hexversion', 'long_info', 'maxint', 'maxsize', 'maxunicode', 'meta_path', 'modules', 'path', 'path_hooks', 'path_importer_cache', 'platform', 'prefix', 'py3kwarning', 'setcheckinterval', 'setdlopenflags', 'setprofile', 'setrecursionlimit', 'settrace', 'stderr', 'stdin', 'stdout', 'subversion', 'version', 'version_info', 'warnoptions']

(b)

darwin
2.7.10 (default, Oct 6 2017, 22:29:07)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)]

(c)略

2-14

print -2*4 + (3**2)

2-15

# /usr/bin/python
# coding:utf8
a = int(raw_input())
b = int(raw_input())
c = int(raw_input())
list1 = [a,b,c]
print sorted(list1)
print sorted(list1,reverse=True)

2-16

略