Eoferror ran out of input python pickle

Python EOFError

An EOFError (End of File Error) is a built-in exception in Python that is raised when the input() function reaches the end of the file while attempting to read a line. This typically occurs when the user presses Ctrl+D (on Unix-based systems) or Ctrl+Z (on Windows systems) to indicate the end of the input stream.

Here’s a simple example that demonstrates how to handle an EOFError :

try: user_input = input("Please enter some text: ") except EOFError: print("EOFError: End of input stream detected")

In this example, if the user presses Ctrl+D or Ctrl+Z while the input() function is waiting for input, the EOFError will be caught by the except block, and the program will display a message indicating that the end of the input stream has been detected.

In some cases, you might want to ignore the EOFError and continue executing your program. You can do this by simply including a pass statement inside the except block:

try: user_input = input("Please enter some text: ") except EOFError: pass # Ignore the EOFError and continue executing the program

In this case, if the user presses Ctrl+D or Ctrl+Z while the input() function is waiting for input, the EOFError will be caught, but the program will continue executing without displaying any error message or taking any other action.

It’s important to note that the EOFError is typically raised in interactive environments where the input is read from the standard input (stdin) or from a file. If your program reads input from other sources, such as sockets or APIs, you may need to handle different exceptions depending on the method used to read the data.

In summary, when working with the input() function or other functions that read input from a file or the standard input, it’s essential to handle the EOFError to ensure that your program behaves gracefully when it encounters the end of the input stream.

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Eoferror ran out of input python pickle

Last updated: Jun 29, 2023
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# Pickle EOFError: Ran out of input in Python [Solved]

The Python «Pickle EOFError: Ran out of input» occurs when the file you are trying to open and load is empty.

To solve the error, check if the size of the file is greater than 0 bytes or handle the EOFError exception.

Here is an example of how the error occurs.

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import pickle with open('employees.txt', 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) 

The code sample assumes that you have an employees.txt file that is empty.

One way to solve the error is to check if the file’s size is greater than 0 bytes before using pickle.

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import os import pickle file_path = 'employees.txt' if os.path.getsize(file_path) > 0: with open(file_path, 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) else: print('The file is empty') 

The os.path.getsize method takes a file path as a parameter and returns the size of the file in bytes.

The if statement checks that the file has a size of greater than 0 bytes (is not empty).

The file in the example is empty, so the else block runs.

Here is a more complete example that writes to a file and then reads from it using pickle.

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import os import pickle file_path = 'employees.txt' employees =  'name': ['Alice', 'Bobby Hadz', 'Carl'], 'age': [29, 30, 31] > with open(file_path, 'wb') as employees_file: pickle.dump(employees, employees_file) if os.path.getsize(file_path) > 0: with open(file_path, 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) else: print('The file is empty') 

We first used the pickle.dump() method to write the employees dictionary to the employees.txt file and then used the pickle.Unpickler() class to read the pickle data stream.

# Make sure you haven’t opened the file in wb mode by mistake

A common cause of the error is opening the file in wb or w mode by mistake.

The w (write) or wb (write binary) modes truncate the file before opening it.

In other words, if you open the file in wb mode, its contents are deleted.

If you then try to open the file in rb (read binary) mode, it will be empty which will cause the «Pickle EOFError: Ran out of input» error.

For example, suppose you have the following code sample.

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import pickle file_path = 'employees.txt' employees =  'name': ['Alice', 'Bobby Hadz', 'Carl'], 'age': [29, 30, 31] > with open(file_path, 'wb') as employees_file: employee_data = pickle.load(employees_file) 

The code sample causes the io.UnsupportedOperation: not readable error because we opened the file in wb mode by mistake.

The wb mode truncates the file (deletes its contents) and is used for writing binary data to the file.

Instead, the rb (read binary) mode should be used for reading the file as we did in the previous subheading.

If the pickled file might be empty, you have to make sure that its size is greater than 0 bytes before reading from it.

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import os import pickle file_path = 'employees.txt' if os.path.getsize(file_path) > 0: with open(file_path, 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) else: print('The file is empty') 

# Handing the EOFError exception in a try/except block

You can also solve the error by using a try/except block.

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import pickle file_path = 'employees.txt' employee_data = > try: with open(file_path, 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) except EOFError: print('An EOFError exception occurred. The file is empty') 

We placed the with open statement in a try block.

If an error occurs, the except block is run.

Using the with open() statement should be your preferred approach over using open() directly because the file is closed even if an error occurs.

The except block is run if an EOFError is raised in the try block.

If an EOFError exception is raised, then the pickled file is empty and you need to handle the exception as you see fit.

For example, you could write to the file as we did in the first subheading.

Alternatively, you can set the outer scope variable to a default value in the except block.

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import pickle file_path = 'employees.txt' employee_data = > try: with open(file_path, 'rb') as my_file: unpickler = pickle.Unpickler(my_file) employee_data = unpickler.load() print(employee_data) except EOFError: print('An EOFError exception occurred. The file is empty') employee_data = > 

# A working example that uses the open() function directly

The previous examples used the with open() statement, however, you can also use the open() function directly.

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import pickle file_path = 'employees.txt' employees =  'name': ['Alice', 'Bobby Hadz', 'Carl'], 'age': [29, 30, 31] > file_path = 'employees.txt' file_output = open(file_path, 'wb') pickle.dump(employees, file_output) file_output.close() file_input = open(file_path, 'rb') data = pickle.load(file_input) # 👇️ print(data) print(type(data)) # file_input.close() 

We first opened the file in wb (write binary) mode and used the pickle.dump() method to write the dictionary to the file.

Make sure to close the file when using the open() function directly.

Otherwise, you’d have a memory leak in your application.

The next step is to open the file in rb (read binary) mode.

The pickle.load method reads the pickled representation of the file.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• OSError: [Errno 30] Read-only file system [Solved]
• Python: Sending multipart/form-data request with requests
• io.UnsupportedOperation: not readable/writable Python Error
• csv.Error: line contains NULL byte Python error [Solved]
• Configure error: no acceptable C compiler found in $PATH
• How to get the last part of a Path in Python
• Taking a file path from user input in Python
• Expected str, bytes or os.PathLike object, not TextIOWrapper
• Get the path of the Root Project directory using Python
• Warning: can’t open/read file: check file path/integrity
• Python: Assert that Mock was called with specific Arguments
• ValueError: unsupported pickle protocol: 5 [Solved]

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#1 Март 30, 2016 13:59:14

Ran out of input

def top_scores(score): """Forms a top scores list""" name = input("Enter your name") f = open("pickles11.dat", "wb+") top_scores = pickle.load(f) top_scores[score] = name pickle.dump(top_scores, f) f.close() keys = top_scores.keys() keys = list(keys) keys.sort(reverse=True) print("\nTop scores:") for i in keys: print(top_scores[i], i) 

При выполнении возникает ошибка:
top_scores = pickle.load(f)
EOFError: Ran out of input

Подскажите, пожалуйста, где здесь проблема.

#2 Март 30, 2016 14:56:55

Ran out of input

#3 Март 30, 2016 15:02:59

Ran out of input

Сначала получаем значение, потом его изменяем и вновь записываем, wb+ это позволяет. Я не прав?

P.S. Да и в принципе не важно, что оно делает, просто подскажите, как сделать, чтобы всё заработало

Отредактировано Stranger (Март 30, 2016 15:06:38)

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