setconstant 1.3.0

A Python package for managing constants effectively.

setconstant

setconstant is a Python package designed to help developers manage constants with type safety, ensuring that constants are defined once and cannot be redefined. This package is perfect for maintaining clean and error-free code when working with immutable values.

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Features

• Type-safe constants: Supports integer, float, and string constants.
• Prevents redefinition: Ensures constants cannot be reassigned after declaration.
• Easy retrieval and deletion: Retrieve or delete constants as needed.
• Custom error handling: Provides descriptive errors for invalid operations.

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Install

pip install setconstant

Import

from setconstant import setconstant

Functions

const_i(name, value) — declare an integer constant

Use this to declare a whole number constant. setconstant.const_i("MAX_USERS", 100) setconstant.const_i("PORT", 8080) setconstant.const_i("MAX_RETRY", 3)

Rules:

• Value must be a whole number. 8.0 or "8" will be rejected.
• True / False are not allowed here. Use const_b() for booleans.

setconstant.const_i("PORT", 8.5) # TypeError — must be int setconstant.const_i("PORT", "8080") # TypeError — must be int setconstant.const_i("PORT", True) # TypeError — use const_b()

const_f(name, value) — declare a float constant

Use this to declare a decimal number constant. setconstant.const_f("PI", 3.14159) setconstant.const_f("TIMEOUT", 30.0) setconstant.const_f("THRESHOLD", 0.95)

Rules:

• Value must have a decimal point. Writing 3 instead of 3.0 will be rejected.

setconstant.const_f("PI", 3) # ❌ TypeError — write 3.0 not 3 setconstant.const_f("PI", "3.14") # ❌ TypeError — must be float not string

const_s(name, value) — declare a string constant

Use this to declare a text constant. setconstant.const_s("APP_NAME", "MyApp") setconstant.const_s("DB_HOST", "localhost") setconstant.const_s("ENV", "production")

Rules:

• Value must be text inside quotes.

setconstant.const_s("ENV", 100) # ❌ TypeError — must be a string

const_b(name, value) — declare a boolean constant

Use this to declare a True / False constant. setconstant.const_b("DEBUG", False) setconstant.const_b("VERBOSE", True)

Rules:

• Value must be exactly True or False.

setconstant.const_b("DEBUG", 1) # ❌ TypeError — must be True or False setconstant.const_b("DEBUG", "yes") # ❌ TypeError — must be True or False

get(name) — read a constant

Use this to get the value of a constant you declared earlier. setconstant.const_i("PORT", 8080)

port = setconstant.get("PORT") print(port) # 8080 Works for all types: setconstant.const_f("PI", 3.14159) setconstant.const_s("ENV", "production") setconstant.const_b("DEBUG", False)

print(setconstant.get("PI")) # 3.14159 print(setconstant.get("ENV")) # production print(setconstant.get("DEBUG")) # False If the constant does not exist: setconstant.get("MISSING") # AttributeError — tells you what constants ARE defined

get_constant(name) — same as get()

This is an older name for get(). Both do the same thing. setconstant.get_constant("PORT") # same as setconstant.get("PORT")

get_type(name) — check what type a constant is

Returns the type that was used when the constant was declared. setconstant.const_i("PORT", 8080) setconstant.const_f("PI", 3.14) setconstant.const_s("ENV", "production")

print(setconstant.get_type("PORT")) # <class 'int'> print(setconstant.get_type("PI")) # <class 'float'> print(setconstant.get_type("ENV")) # <class 'str'>

is_defined(name) — check if a constant exists

Returns True if the constant has been declared, False if not. Useful before trying to read a constant you are not sure about. setconstant.const_i("PORT", 8080)

print(setconstant.is_defined("PORT")) # True print(setconstant.is_defined("UNKNOWN")) # False Safe declare pattern — declare only if not already declared: if not setconstant.is_defined("PORT"): setconstant.const_i("PORT", 8080)

summary() — print a table of all constants

Prints all declared constants in a readable table. Useful for debugging. setconstant.const_i("PORT", 8080) setconstant.const_s("HOST", "localhost") setconstant.const_f("TIMEOUT", 30.0) setconstant.const_b("DEBUG", False)

setconstant.summary() Output: ┌──────────┬──────────┬─────────────┐ │ Name │ Type │ Value │ ├──────────┼──────────┼─────────────┤ │ PORT │ int │ 8080 │ │ HOST │ str │ 'localhost' │ │ TIMEOUT │ float │ 30.0 │ │ DEBUG │ bool │ False │ └──────────┴──────────┴─────────────┘

Important Rules Once declared, a constant can never be changed. setconstant.const_i("PORT", 8080) setconstant.const_i("PORT", 9090) # ValueError — already declared setconstant.PORT = 9090 # AttributeError — direct assignment blocked Re-declaring with the exact same value is fine (safe for Jupyter / Colab re-runs): setconstant.const_i("PORT", 8080) setconstant.const_i("PORT", 8080) # same value — no error const_s() and other declare methods return nothing — always use get() to read:

Wrong

print(setconstant.const_s("ENV", "production")) # prints None

Correct

setconstant.const_s("ENV", "production") print(setconstant.get("ENV")) # prints production

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Full Example

from setconstant import setconstant

Declare

setconstant.const_i("MAX_USERS", 500) setconstant.const_f("PI", 3.14159) setconstant.const_s("APP_NAME", "MyApp") setconstant.const_b("DEBUG", False)

Read

print(setconstant.get("MAX_USERS")) # 500 print(setconstant.get("PI")) # 3.14159 print(setconstant.get("APP_NAME")) # MyApp print(setconstant.get("DEBUG")) # False

Check

print(setconstant.is_defined("PI")) # True

Type

print(setconstant.get_type("PI")) # <class 'float'>

View all

setconstant.summary()

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Developer

Anuraj R

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