1.把一个数字的list从小到大排序，然后写入文件，然后从文件中读取出来文件内容，然后反序，在追加到文件的下一行中
import codecs
def paixu(l):
for i in xrange(0,len(l)-1):
for j in xrange(0,len(l)-i-1):
if l[j]>l[j+1]:
l[j],l[j+1] = l[j+1],l[j]
return l
if __name__ == "__main__":
new_list= list(input("please input a list,like( 1,2,3): "))
print ("oringin date: ")
print (new_list)
list1 = paixu(new_list)
print ("sorted: " )
print (list1)
with codecs.open("paixu.txt","w") as file1:
for i in list1:
file1.write(str(i))
file1.write("\n")
file1.close()
with codecs.open("paixu.txt","r") as file2:
list2 = file2.readlines()
print("read data: ")
print(list2)
file2.close()
with codecs.open("paixu.txt","a") as file3:
list3 = sorted(list2,reverse=True)
for j in list3:
file3.write(str(j))
print("reversed : ")
print(list3)
file3.close()
结果：
please input a list,like( 1,2,3): 1,3,5,7,9,0,2,4,6,8
oringin date:
[1, 3, 5, 7, 9, 0, 2, 4, 6, 8]
sorted:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
read data:
['0\n', '1\n', '2\n', '3\n', '4\n', '5\n', '6\n', '7\n', '8\n', '9\n']
reversed :
['9\n', '8\n', '7\n', '6\n', '5\n', '4\n', '3\n', '2\n', '1\n', '0\n']
2.分别把 string， list， tuple， dict写入到文件中
# 1）字符串
import codecs
str1= raw_input("please input a string: ")
with codecs.open("example.txt","w") as file1:
file1.write(str1)
file1.close()
运行：please input a string: huangzhenping
结果：huangzhenping
# 2）列表和元组
import codecs
list2 = list(raw_input("please input a list: "))
with codecs.open("example.txt","w") as file2:
for i in list2:
file2.write(str(i))
file2.close()
运行：please input a list: a,b,c,1,2,3
结果：a,b,c,1,2,3
# 3）字典
import codecs
dict1 = dict(name="hzp",sex="male",age="27")
with codecs.open("example.txt","w") as file3:
for x,y in dict1.iteritems():
file3.write(str(x) + ":" + str(y) + "\n")
file3.close()
结果：
age:27
name:hzp
sex:male
