(python)编程小练习

1、将一串字符串反向输出,如将"abcd"变成“dcba”

str1="abcd"
print str1[::-1]

2、判断是否为回文——判断用户输入的字符串是否为回文。回文是指正反拼写形式都是一样的词,譬如“racecar”。

while(1):
input_str = raw_input("please input your string:")
if input_str=="quit":
print "bye"
break
elif input_str==input_str[::-1]:
print "your input is huiwen"
else:
print "your input is not huiwen"

3、统计一段英文语句的字母个数:

#!coding=utf-8
txt="Failure is probably the fortification in your pole"
count={}
for i in txt:
count.setdefault(i,0)#如果字典中没有key为i的键,则添加这个键,并设置该键的值为0。如果已经有这个键了,则不更改该字典
count[i]=count[i]+1
print count

4、统计一段英文语句中单词的个数:

#!coding=utf-8
txt="Failure is probably the fortification in your pole is"
strlist=txt.split(" ")
countWord={}
for i in strlist:
countWord.setdefault(i,0)
countWord[i]=countWord[i]+1
print countWord

  

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