异常处理文本：
filename = ‘alice.txt‘
try:
    with open(filename,encoding=‘utf-8‘) as f:

        contents = f.read()
except FileNotFoundError:
    msg = ‘文件不存在...‘

else:
    words = contents.split()
    num_words = len(words)
    print(‘the file‘ + filename + ‘ has about ‘ + str(num_words))               如果文件不存在，抛出异常，如果存在，打印出有多少个元素，，默认空格分割


函数式：

filename = ‘alice.txt‘

def number_worlds():
    try:
        with open(filename,encoding=‘utf-8‘) as f:
            contents = f.read()
    except FileNotFoundError:
        print("the file dose not exits")

    else:
        content_worlds = contents.split()
        words = len(content_worlds)

        print("the file has "  +  str(words) + " words" )

number_worlds()

for 循环 处理多个文本：

def number_worlds():
    try:
        with open(filename,encoding=‘utf-8‘) as f:
            contents = f.read()
    except FileNotFoundError:
        print("the file dose not exits")

    else:
        content_worlds = contents.split()
        words = len(content_worlds)

        print("the file has "  +  str(words) + " words" )

filenames = [‘a.txt‘,‘b.txt‘,‘alice.txt‘]
for filename in filenames:
    number_worlds()

def number_worlds():
    try:
        with open(filename,encoding=‘utf-8‘) as f:
            contents = f.read()
    except FileNotFoundError:
       pass

    else:
        content_worlds = contents.split()
        words = len(content_worlds)

        print("the file has "  +  str(words) + " words" )

filenames = [‘a.txt‘,‘b.txt‘,‘alice.txt‘]
for filename in filenames:
    number_worlds()

line = "Row,row,row your boat"
print(line.count(‘row‘))
print(line.lower().count(‘row‘))              count 统计相同的单词出现多少次，lower，将字符串转换为小写




json dump存储数据：

import json
number = [2,3,4,5,6,7,8,9]

filename = ‘alice.txt‘

with open(filename,‘a‘,encoding=‘utf-8‘) as f:
    json.dump(number,f)

import json

username = str(input("what is your name:"))
password = str(input("please input your psswd:"))

SQL = {}
SQL[username] = password

with open(‘alice.txt‘,‘a‘,encoding=‘utf-8‘) as f:
    json.dump(SQL,f)

json load读取数据：

import json
filename = ‘alice.txt‘
with open(filename,encoding=‘utf-8‘) as f:
    numbers = json.load(f)
print(numbers)

import json
def get_str():
    filename = ‘alice.txt‘
    try:
        with open(filename,encoding=‘utf-8‘) as f:
            str_load = json.load(f)
            print(str_load)


    except FileNotFoundError:
        name = input("what your name:")
        passwd = input("please inout your passwd:")

        dicts = {}
        dicts[name] = passwd
        with open(filename,‘w‘,encoding=‘utf-8‘) as f:
            json.dump(dicts,f)

get_str()

from open_file import get_formatted_name

print("Enter ‘q‘ at any time to quit")

while True:
    first = input("\nPlease give me a first name:")
    if first == ‘q‘:
        break
    last = input("Please give me a last name:")
    if last == ‘q‘:
        break

    formatted_name = get_formatted_name(first,last)
    print("\tNealty formatted name: " + formatted_name + ‘.‘)

单元测试：：

import unittest
from open_file import get_formatted_name

class NameTestCase(unittest.TestCase):

    def test_first_name(self):
        formatted_name = get_formatted_name(‘zn‘,‘zyy‘)

        self.assertEqual(formatted_name,‘Zn Zyy‘)
unittest.main()

2017-5-17 分析文本