How Can I Efficiently Read Multiple Lines of User Input in Python?

Efficiently Reading Multiple Lines of User Input in Python

In Python, efficiently reading multiple lines of user input is crucial for many applications. This article explores a simple yet effective method to achieve this.

To begin, we define a sentinel value to indicate the end of input. The iter function is then employed to iterate over each line of input received, continuing until the sentinel value is encountered. This approach ensures that the input reading process can continue uninterrupted as long as the user provides input.

For scenarios where you require each line of input as a string, you can use str.join to concatenate the lines into a single string, separated by line breaks (n). This provides a convenient way to store or further process the multi-line input as needed.

The code snippet below demonstrates these techniques:

sentinel = ''  # ends when this string is seen

for line in iter(input, sentinel):
    pass  # do things here

# get every line as a string
input_lines = '\n'.join(iter(input, sentinel))

Alternatively, for Python 2 users, the following code snippet using raw_input can be utilized:

input_lines = '\n'.join(iter(raw_input, sentinel))

By employing these techniques, you can effectively read and process multiple lines of raw input in Python, providing a robust solution for your programming needs.

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