python过滤文件内容

我是新来的python，我想做下面的任务，但我的输出是不一样的，它应该是。任何人都可以帮我解决这个问题吗？我感谢你的帮助！python过滤文件内容

分配：

在第三个节目，我们一起来看看到的文件内容进行分类。在与源代码相同的目录中有一个文件“strings.txt”，它有几行随机字符串。这些行可以分为两组：只有字母（a-z，A-Z）和数字（0-9）的行，以及也有随机特殊字符（？，&，@，$ ...）的行。

创建一个从文件中读取所有行并测试行的程序。如果该行只有字母和/或数字，程序将打印出“[line] OK”。如果该行有特殊字符，程序应打印“[line]无效”。当程序运行，它打印出这样的事：

5345m345ö34l was ok. 
no2no123non4 was ok. 
noq234n5ioqw#% was invalid. 
%#""SGMSGSER was invalid. 
doghdp5234 was ok. 
sg,dermoepm was invalid. 
43453-frgsd was invalid. 
hsth())) was invalid. 
bmepm35wae was ok. 
vmopaem2234+0+ was invalid. 
gsdm12313 was ok. 
bbrbwb55be3"?"#? was invalid. 
"?"#%#"!%#"&"?%%"?#?#"?" was invalid. 
retrte#%#?% was invalid. 
abcdefghijklmnopqrstuvxy was ok.

这是明智的读取线一次一个，与isalmun（）字符串测试对其进行测试，并从那里继续。另外请记住，字符串也可能以换行符结束（\ n），这是允许的，但如果不切掉.isalnum（）测试则失败。示例输出

5345m34534l was invalid. 
no2no123non4 was ok. 
noq234n5ioqw#% was invalid. 
%#""SGMSGSER was invalid. 
doghdp5234 was ok. 
sg,dermoepm was invalid. 
43453-frgsd was invalid. 
hsth())) was invalid. 
bmepm35wae was ok. 
vmopaem2234+0+ was invalid. 
gsdm12313 was ok. 
gswrgsrdgrsgsig45 was ok. 
)/(/)(#=%#)%/ was invalid. 
++-+-+--+--+-+>-<+-<<_<-+>>++ was invalid.

我的代码是

handle = open("strings.txt","r") 
content = handle.read() 
content.isalnum() 
for i in content: 
    if content.isalnum()==True: 
     print(content,"was ok") 
    else: 
     print(content,"was invalid") 

handle.close()

我的输出为

5345m34534l 
no2no123non4 
noq234n5ioqw#% 
%#""SGMSGSER 
doghdp5234 
sg,dermoepm 
43453-frgsd 
hsth())) 
bmepm35wae 
vmopaem2234+0+ 
gsdm12313 
gswrgsrdgrsgsig45 
)/(/)(#=%#)%/ 
++-+-+--+--+-+>-<+-<<_<-+>>++. was invalid 
5345m34534l 
no2no123non4 
noq234n5ioqw#% 
%#""SGMSGSER 
doghdp5234 
sg,dermoepm 
43453-frgsd 
hsth())) 
bmepm35wae 
vmopaem2234+0+ 
gsdm12313 
gswrgsrdgrsgsig45 
)/(/)(#=%#)%/ 
++-+-+--+--+-+>-<+-<<_<-+>>++. was invalid 
5345m34534l 
no2no123non4 
noq234n5ioqw#% 
%#""SGMSGSER 
doghdp5234 
sg,dermoepm 
43453-frgsd 
hsth())) 
bmepm35wae 
vmopaem2234+0+ 
gsdm12313 
gswrgsrdgrsgsig45 
)/(/)(#=%#)%/ 
++-+-+--+--+-+>-<+-<<_<-+>>++. was invalid 

# etc ad nauseum...

我在做什么错？

来源

2014-03-06 user3358884

handle = open("strings.txt","r") 
content = handle.read() # <= here you read in the entire file 
content.isalnum() 
for i in content:  # <= here you iterate over each **character** of the file 
    if content.isalnum()==True: 
     print(content,"was ok") 
       #^here you print the entire input file each time 
    else: 
     print(content,"was invalid") 
       #^(ditto) which is why you have so much output 
handle.close()

相反，尝试

with open("strings.txt") as inf: 
    for line in inf: 
     line = line.rstrip() 
     if line.isalnum(): 
      print("{} was ok".format(line)) 
     else: 
      print("{} was invalid".format(line))

来源

2014-03-06 02:25:50

嗨，它看起来这是工作，除了一个错误。在“无效”之前的行结尾处有一个额外的“。”。像这样：++ - + - + - + - + - +> - <+-<<_<-+>> ++。无效。但它应该是这样的：++ - + - + - + - + - +> - <+-<<_<-+>> ++无效。点（。）从哪里来？ – user3358884

@ user3358884：检查你的输入文件，我几乎保证你的时间在那里。 –

嗨，输入文件不是我的，它是系统生成的输入。我正在做一个自学工具viope.com上的任务，您只需执行代码，系统会通过提供自己的输入文件来检查您的代码。 – user3358884

我想输出是错误的，因为你读整个文件到一个字符串，遍历该文件的所有字符。你的“内容”变量是一个字符串，所以代码不会逐行检查。它检查整个文件并打印整个文件无效。

我的回答：

 

file = open("strings.txt","r") 
content = file.readlines() 
for i in content: 
    if i.rstrip().isalnum(): 
     print(i+" was ok.") 
    else: 
     print(i+" was invalid.") 
file.close()

来源

2017-06-29 01:48:58

python过滤文件内容

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