Python: Convert string values of a given dictionary, into integer/float datatypes

Last update on April 21 2025 13:00:49 (UTC/GMT +8 hours)

49. Convert String Values in Dictionary to Numeric Types

Write a Python program to convert string values of a given dictionary into integer/float datatypes.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'convert_to_int' that converts string values in a list of dictionaries to integers.
def convert_to_int(lst):
    # Use a list comprehension to iterate through each dictionary 'b' in the list 'lst'.
    # For each dictionary, convert the string values to integers and create a new dictionary.
    result = [dict([a, int(x)] for a, x in b.items()) for b in lst]
    return result

# Define a function 'convert_to_float' that converts string values in a list of dictionaries to floats.
def convert_to_float(lst):
    # Use a list comprehension to iterate through each dictionary 'b' in the list 'lst'.
    # For each dictionary, convert the string values to floats and create a new dictionary.
    result = [dict([a, float(x)] for a, x in b.items()) for b in lst]
    return result

# Create a list of dictionaries 'nums' with keys and string values.
nums_int = [
    {'x': '10', 'y': '20', 'z': '30'},
    {'p': '40', 'q': '50', 'r': '60'}
]

# Print a message indicating the start of the code section and the original list of dictionaries.
print("Original list:")
print(nums_int)

# Print a message indicating the intention to convert string values to integers.
print("\nString values of a given dictionary, into integer types:")

# Call the 'convert_to_int' function to convert string values to integers and print the resulting list of dictionaries.
print(convert_to_int(nums_int))

# Create a list of dictionaries 'nums' with keys and string values in floating-point format.
nums_float = [
    {'x': '10.12', 'y': '20.23', 'z': '30'},
    {'p': '40.00', 'q': '50.19', 'r': '60.99'}
]

# Print a message indicating the start of the code section and the original list of dictionaries.
print("\nOriginal list:")
print(nums_float)

# Print a message indicating the intention to convert string values to floats.
print("\nString values of a given dictionary, into float types:")

# Call the 'convert_to_float' function to convert string values to floats and print the resulting list of dictionaries.
print(convert_to_float(nums_float)) 

Sample Output:

Original list:
[{'x': '10', 'y': '20', 'z': '30'}, {'p': '40', 'q': '50', 'r': '60'}]

String values of a given dictionary, into integer types:
[{'x': 10, 'y': 20, 'z': 30}, {'p': 40, 'q': 50, 'r': 60}]

Original list:
[{'x': '10.12', 'y': '20.23', 'z': '30'}, {'p': '40.00', 'q': '50.19', 'r': '60.99'}]

String values of a given dictionary, into float types:
[{'x': 10.12, 'y': 20.23, 'z': 30.0}, {'p': 40.0, 'q': 50.19, 'r': 60.99}]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to iterate over a dictionary and convert numeric string values to integers using int().
• Write a Python program to update dictionary values to float if they contain a decimal point, otherwise to int.
• Write a Python program to use try/except to safely cast dictionary string values to numeric types.
• Write a Python function that checks each value of a dictionary and converts it to a numeric type if possible.

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• Python Data Types Dictionsry Exercises Home ↩
• Python Exercises Home ↩

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