Python – To convert a list of strings with a delimiter to a list of tuple

Converting a list of strings with delimiters to a list of tuples is a common task in Python. This can be achieved using list comprehension combined with the split() method to break strings at delimiter positions.

Basic Example

Here's how to convert delimiter-separated strings into tuples of integers ?

data_list = ["33-22", "13-44-81-39", "42-10-42", "36-56-90", "34-77-91"]

print("Original list:")
print(data_list)

delimiter = "-"
result = [tuple(int(element) for element in item.split(delimiter)) for item in data_list]

print("\nConverted to tuples:")
print(result)

Original list:
['33-22', '13-44-81-39', '42-10-42', '36-56-90', '34-77-91']

Converted to tuples:
[(33, 22), (13, 44, 81, 39), (42, 10, 42), (36, 56, 90), (34, 77, 91)]

Different Delimiters

The same approach works with various delimiter characters ?

# Using comma delimiter
csv_data = ["10,20,30", "40,50", "60,70,80,90"]
comma_result = [tuple(int(x) for x in item.split(",")) for item in csv_data]

print("Comma-separated result:")
print(comma_result)

# Using pipe delimiter
pipe_data = ["red|green|blue", "yellow|orange"]
pipe_result = [tuple(item.split("|")) for item in pipe_data]

print("\nPipe-separated result:")
print(pipe_result)

Comma-separated result:
[(10, 20, 30), (40, 50), (60, 70, 80, 90)]

Pipe-separated result:
[('red', 'green', 'blue'), ('yellow', 'orange')]

How It Works

The conversion process involves three key steps:

• Split: item.split(delimiter) breaks each string into a list of substrings

• Convert: int(element) converts each substring to the desired data type

• Tuple: tuple() converts the list of converted elements into a tuple

Handling Mixed Data Types

You can also work with mixed data types by applying different conversions ?

mixed_data = ["John-25-Engineer", "Alice-30-Designer", "Bob-28-Developer"]

def parse_record(record):
    parts = record.split("-")
    return (parts[0], int(parts[1]), parts[2])

result = [parse_record(item) for item in mixed_data]

print("Mixed data tuples:")
print(result)

Mixed data tuples:
[('John', 25, 'Engineer'), ('Alice', 30, 'Designer'), ('Bob', 28, 'Developer')]

Conclusion

Use list comprehension with split() and tuple() to convert delimiter-separated strings into tuples. This approach is efficient and handles various delimiters and data types flexibly.