Using python to process txts
Dealing with txts in Python mainly involved the following aspects: * * 1. Open and Close a file ** 1. * * Open the file ** - Open the file with the `open ()` function, which accepts two parameters: the file name and the mode to open the file. The common patterns were: - "r": Open the file in read mode. You can read the file information. If the file does not exist, an error occurs. For example,`file = open ('example.txt','r')`. - "w": Open the file in write mode, you can write information to the file. If the file exists, clear the file and write new content; if the file does not exist, create it. For example,`file = open ('new_file. txt','w')`. - "A": Open the file in the appending mode (that is, once the file is opened, the file pointer will automatically move to the end of the file). If the file does not exist, create it. For example,`file = open ('existing-file.txt','a')`. - "r +": Open the file in read-write mode, allowing you to read and write the file. - "w +": Erases the contents of the file and then opens the file in read-write mode. - "A +": Open the file in read-write mode and move the file pointer to the end of the file. - In addition, you can also use the `with` statement to open the file. The advantage of this statement is that the file will automatically close after the code block is executed. For example,`with open ('data.txt','r') as f: `. 2. * * Close the file ** - If you use the `open ()` function to open the file directly (instead of the `with` statement), you need to use the `close ()` method to close the file after using it. For example,`file. close ()`. This was because if the file was not closed, there was a risk of losing data or damaging the file, and it would take up the number of open file handles in the system. * * 2. Read the contents of the file ** 1. * *`read ()` method ** - It is used to read the entire contents of a file as a string. It accepts the option `size`, which mentions the number of characters to read from the file. If `size` is not set, the entire file will be read. For example: ```python file = open('example.txt', 'r') contents = file.read() print(contents) file.close() ``` 2. * *`readline ()` method ** - It is used to read the file line by line. By default, it reads the first line in the file. You can use a loop to read each line of the file, for example: ```python file = open('example.txt', 'r') line = file.readline() while line: print(line) line = file.readline() file.close() ``` 3. * *`readlines ()` method ** - It is used to read all the lines of the file at once and return a list of strings, where each string is a row of data. For example: ```python file = open('example.txt', 'r') lines = file.readlines() for line in lines: print(line) file.close() ``` * * 3. Write the contents of the file ** 1. * *`write ()` method ** - If you open the file in write ("w ") or add (" a ") mode, you can use the `write ()` method to write the data to the file. For example: - Open the file in write mode (if the file does not exist, create it, if it does exist, erase it): ```python file = open('output.txt', 'w') file.write('Hello, World! ') file.close() ``` - Open the file in Append mode (Create if the file doesn't exist): ```python file = open('output.txt', 'a') file.write('\nThis is a new line. ') file.close() ``` 2. * *`writelines ()` method ** - You can write a line list to a file. For example: ```python lines = ['line1\n', 'line2\n'] file = open('output.txt', 'w') file.writelines(lines) file.close() ``` * * 4. Other methods and attributes in file operation ** 1. * * Operation of the file pointer ** - `seek (offset [, where])`: Move the file pointer to the `offset` position relative to `where`.` where `= 0 indicates the beginning of the file (default); 1 indicates the current position; 2 indicates the end of the file. - `tell ()`: Obtain the file pointer location. 2. * * Other operations ** - `fileno ()`: Obtain the file description, which is a number. - `flush ()`: Flushes the output buffer. - `isatty ()`: If the file is an interaction terminal, return `True`; otherwise, return `False`. - `intercept ([size])`: intercept the file to make it `size`. Read more exciting novels for free
I love you deeply, but my love is shallow. The full text of the novel is free to read.
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Fuji Cameras
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Father and daughter turn against each other and become enemies.
Whisper in private
"Whispering" was the wrong usage. The correct usage was "whispering". Whispering is an idiom that can be used in a sentence like this: In class, two naughty students were whispering in the back row and were discovered by the teacher. Whispers came from that room. I don't know what the people inside are discussing. They were whispering about the mysterious plan. It was mainly used to describe how two or more people talked in private. The novel " Mixed Flowers " is equally exciting. Everyone is welcome to click and read it!
Bevasil's Children's Song Played 500 Times
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AI Writing Ppt
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Zhou Dedong E-book Collection
" I've Transformed into a Golden Eagle " by Brother Eagle. The male lead, Hu Yang, was a reborn Golden Eagle, 0 years old, Taurus, and the female supporting character, Xiao Ying. This was a mutated beast language. Due to the revival of the golden rain's spiritual qi, there were no foreign race ruins or anything like that. Some people complained that it was too early and the recovery of reiki was slow, but overall, it was not bad. "Entertainment Library," written by hemp clothes weaving dreams. The male protagonist, Zhou Fang, traveled through a parallel time and space, and the entertainment library was above his head. He was originally an orphan. After transmigrating, he had parents. He used the entertainment works on Earth to shine in the other world. His routine was full and smooth. The new book was not on the shelves yet, but it was an entertainment novel that could be read easily. 'My Red Alert, My Soldier' was a doomsday novel written by Autumn Catcher. The male lead Wang Tu, several supporting roles. Zombies, insects, and beasts wreaked havoc. Humans struggled, and the male protagonist formed a line of defense to counterattack. Three views are correct, IQ is online, red police are violent, new books are available. 'Longevity Martial Arts: I Come to the Human World to Open the Path of Immortality', an immortal chivalrous text. The male protagonist, Qing Changge, was 13 years old. He wanted to seek longevity in the martial arts world. He had a cheat and stepped on the road to immortality. Many years later, he became a very powerful character. " Welcome the next genius mid-laner ", an esports essay written by Twilight Darknorth. The male lead, Xun Ruomeng, returned to S7 and became a professional player. The female lead, Ning Xuan. This book is of a high standard. I recommend it. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
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He recommended a few novels. " The Great Dao of Primordial Creation " was a cultivation novel written by White Shirt of the Clouds. The story started from antiquity times. Pangu created the Untainted Land, and there were the Tribulation of Fierce Beasts, the struggle between Dragon and Han, the struggle between Taoism and Demon, the appearance of the Sage of Zixiao, and the appearance of many great gods, such as Taiyi, Emperor Jun, Goddess Nvywa, etc. Every expert had their own story, and the era was magnificent. The Book Desolation Savior was an Eastern fantasy novel with a bad luck. A hundred years after the recuperation of reiki, the Daoist book system was established, and there was a global book shortage. The young Wu Ni had a golden finger for pushing books. His words were super funny. This was the story of a reverse plagiarist who made a fortune by selling blades. His brain was very strange. " Doomsday Rebellion " was a sci-fi doomsday crisis novel written by a coward. After the rainbow-colored light rain fell on Earth, the world became a game. There were also opportunities when the apocalypse arrived. The loser turned the tables on the tall, rich, and handsome man. It felt good in the early stages. Although it collapsed a little later, it was overall good. " Black Basket: The Virtual Vision of the Gods at the Beginning " was a manga novel by Bengbengsha Karaka. The protagonist, Jin Muyan, awakened the strongest system in the basketball world of Black. " Rebirth: Doomsday Counterattack " was a mysterious detective novel in the rainy season. The female protagonist was reborn before the end of the world, and she counterattacked from cannon fodder, full of blows and resistance. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>