Function Name:
dict
Function Signature:
class dict(**kwarg)
class dict(mapping, **kwarg)
class dict(iterable, **kwarg)
Function Overview:
- The dict() function is a constructor to the Python dict class.
- dict() function constructs and returns the dictionary objects.
- Dictionaries are used to hold key, value pairs.
- A dictionary is a mapping type in Python - it has keys mapped to values.
- The Python dict class represents a dictionary.
- dict objects are mutable, that is mappings can be added and removed from a dictionary instance.
Example1:
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electronCount = {"hydrogen":1, "helium": 2, "lithium":3 }
print("Number of electrons a hydrogen atom has:{}".format(electronCount["hydrogen"]))
print("Number of electrons a helium atom has:{}".format(electronCount["helium"]))
print("Number of electrons a lithium atom has:{}".format(electronCount["lithium"]))
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Output:
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Number of electrons a hydrogen atom has:1 Number of electrons a helium atom has:2 Number of electrons a lithium atom has:3 |
Example2:
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# Build list of countries - ISO code vs Name of the country countryCodes = {"CA":"Canada", "US":"United States of America", "MX":"Mexico" }
print("Country Codes : {}".format(countryCodes))
# Add more countries countries countryCodes["CU"] = "Cuba" countryCodes["JM"] = "Jamaica"
print("Country Codes : {}".format(countryCodes))
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Output:
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Country Codes : {'CA': 'Canada', 'US': 'United States of America', 'MX': 'Mexico'} Country Codes : {'CA': 'Canada', 'US': 'United States of America', 'MX': 'Mexico', 'CU': 'Cuba', 'JM': 'Jamaica'} |