python学习【一】

python学习

#coding=utf-8
#2题===============取出整数成为一个字符串==============
#str="sjdkf11kjsfdskl123121";
#str1=[];
#for num in str:
#	if num.isdigit():
#		str1.append(num);
#print "".join(str1);
#第二种做法
#lists=list(str);
#info=filter(lambda x:x.isdigit(),lists);
#print ''.join(info);
#3题=================统计字符出现次数====================
# strs="abcdsjfklsjflkajlkajklsfd";
# strs=strs.lower();
# dicts={item:strs.count(item) for item in strs};
# print dicts;

#5题================去重字符串安装自然序排序============
# str="sdjfksljflkaaaalksjdflkjdslkfdslkj";
# a_list = list(str);
# s_list = list(set(a_list));
# s_list.sort(reverse=False);
# print ''.join(s_list);
#---------------


#6题==============反转字符串输出=======================
#str="1231ADFSSSFDSaasdfjdslkBBBjkdsjfslkdjklLKJDSLKFJSALK111";
# a_list = list(str);
# a_list.reverse();
# print ''.join(a_list);
# print str[::-1];
#===============大小写混合======================================
# str="1231ADFSSSFDSaasdfjdslkBBBjkdsjfslkdjklLKJDSLKFJSALK111";
# List_info = sorted(str);
# a_upper_List=[];
# a_lower_list=[];
# for item in List_info:
# 	if item.isupper():
# 		a_upper_List.append(item);
# 	elif item.islower():
# 		a_lower_list.append(item);
# for y in a_upper_List:
# 	y_lower = y.lower();
# 	if y_lower in a_lower_list:
# 		num=a_lower_list.index(y_lower);
# 		a_lower_list.insert(num,y);
# print "".join(a_lower_list);
#=======================判断字符串是否出现对应字符串里面==============
# str="abcdefghioy";
# search="boy";
# list_search=list(search);
# from_str=set(str);
# from_str.update(list_search);
# len1=len(list(from_str));
# len2 = len(str);
# if len1 == len2:
# 	print 1;
# else:
# 	print 2;
#===============判断boy,girl是否出现在a字符串里面===================
# str="abcdefghioyrl";
# search=['boy','girl'];

# target_str=set(str);
# for item in search:
# 	target_str.update(item);
# if len(str) == len(target_str):
# 	print 111
# else:
# 	print 2222;
#==============统计字符串a出现次数最高字符=======================
# str="afsjlkfajslkfakskjfdakjfsakjfsaaaaa";
# dict={};
# for item in str:
# 	num = str.count(item);
# 	dict[item]=num;
# newdict = sorted(dict.items(),key=lambda item:item[1], reverse=True);
# print newdict;
#==============