字符串在数据的预处理还是很重要的。今天来主要温习一下这部分。
紧跟时代大潮，以下每个小函数的功能都将以 English 介绍之。
Quickly get on the bus!
实例1
- Function : count the number of vowels
# 计算给出的字符串中，元音字母aeiouAEIOU的个数，区分大小写
s = 0
def vowels(s):
s = raw_input()
count = 0
print('please input some words : ', s) # 输入s
if
for c in s: # 循环s，并累加元音字母的个数
if c in 'aeiouAEIOU':
count = count + 1
return count
实例2
- Function : upper the first letter of every words in our file
# 将文件中的名字，首字母大写，其余字母小写
f = open(file, mode)
# file要自己根据文件所在路径填写，mode默认就是read，w代表write
for line in f:
line = line.strip() # 去掉空格
print(line.title()) # 首字母大写
f.close() # remember close your file !!!!!
实例3
- Function : find and print all the palindrome in our files
def is_panlindrom(name): # 回文字符
low = 0 # index of the left letter
high = len(name) - 1 # index of the right letter
# compare two letters
while low < high: # when left letter not equal to right letter
if name[low] != name[high]:
return False # this is not a panlidrom
low += 1 # move a step to right
high -= 1 # move a step to left
return True
f = open(file, mode)
for line in f:
line = line.strip()
if is_panlindrom(line):
print(line)
f.close()
Attention
- Assign the new value to the original character when you've already modified your string
- close the file if you've opened it
The 2nd Edition
正则表达式的故事
正则表达式用来描述字符串的模式
import re # regular
pattern = 'xxxxx'
re.search(pattern, str)
- nothing to say... help yourself
后续会有更新，等我多学关于正则表达式的相关内容的。小朋友我们下次见！