How to Print a Sequence of Integers as a Continuous String in Python

In Python, working with sequences of numbers is a common task, especially when you need to print them in a specific format. One such task is to print a series of integers from 1 through n as a continuous string without spaces.

In this blog, I will guide you through a simple Python program that accomplishes this.

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Problem Statement

Given a number n, you need to print the sequence of integers from 1 to n as a continuous string, without any spaces or separators.

For example, if n = 5, the expected output should be:

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12345

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Solution Approach

We can break down the solution into the following steps:

1. Input the integer n from the user.

2. Generate a range of numbers from 1 through n.

3. Convert each number to a string.

4. Join all the strings together without spaces.

5. Print the result.

Let’s look at how this can be done in Python.

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Code Example

Here’s the Python code to solve the problem:

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n = int(input())  # Read input from the user
numbers = range(1, n+1)  # Create a range from 1 to n
l = "".join(map(str, numbers))  # Convert each number to string and join without spaces
print(l)  # Output the result

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Explanation

1. Input Handling: The input() function captures the input from the user, which is then converted into an integer using int().

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    n = int(input())  # Read input from the user
   

2. Generate a Sequence of Numbers: We use range(1, n+1) to create a sequence from 1 to n. The range() function generates numbers from the first argument (inclusive) to the second argument (exclusive). Thus, range(1, n+1) includes the number n.

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    numbers = range(1, n+1)  # Create a range from 1 to n
   

3. Convert and Join the Numbers: We need to convert each number in the sequence to a string. This is where the map() function helps us by applying str() to each element in numbers. Next, "".join(...) concatenates all the strings without spaces, resulting in a continuous sequence.

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    l = "".join(map(str, numbers))  # Convert each number to string and join without spaces
   

4. Print the Result: Finally, we print the concatenated string.

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    print(l)  # Output the result
   

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Example

Let’s walk through an example. Suppose the user inputs 5.

• Input: 5

• Generated Sequence: [1, 2, 3, 4, 5]

• String Representation: '1', '2', '3', '4', '5'

• Final Output: 12345

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Why This Approach?

• Efficiency: The solution is optimized to work in linear time, as it processes each number in the sequence once.

• Simplicity: Using map() and join() together simplifies the process of converting numbers to strings and concatenating them without the need for additional loops.

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Conclusion

Printing a sequence of numbers as a continuous string in Python can be done easily using the combination of map() and join(). This approach helps you keep your code clean and efficient while avoiding the use of loops for string concatenation.