DailyCalc - A Simple Calculator

python>=3.11

dependency : colorama (not mandatory, if you don't need highlight, you can uninstall it later)

Description

A simple calculator based on decimal.Decimal.

Decimal “is based on a floating-point model which was designed with people in mind, and necessarily has a paramount guiding principle – computers must provide an arithmetic that works in the same way as the arithmetic that people learn at school.” – excerpt from the decimal arithmetic specification

Output is rounded with maximum 10 decimal place for Infinitesimal decimals.

sqrt(2)     => 1.4142135624   # keep 10 decimal places
0.1 + 0.2   => 0.3
ln(exp(10)) => 10.0000000000  # inevitable loss of precision

Usage

install by pip

pip install dailycalc

import into your code

from dailycalc import calculate, check_calc

if check_calc("sum(123, 3)"):
    print(calculate("sum(123, 3)"))

# or

try:
    print(calculate("sum(123, 3)"))
except ValueError as e:
    print(e)

once-off calculate

python -m dailycalc "sum(0.1, 0.2)"

iteractive mode

python -m dailycalc -i
# or
idailycalc

Operators & Functions

supporting:

+ - \* / ^

sum max min abs round hex oct sqrt log ln exp

Interactive mode

Every result is stored in register from [a-z] cyclically, that is when reaching the last one "z", the register would go back to "a" and cover the old value.

"@a" gives the value in "a". "@@" gives the previous result.'

for example:

Support HEX, OCT, Scientific input

1. HEX: 0x12E, 0X12E only support integar
2. OCT: 0o123, 0O123 only support integar
3. Scientific Notation: -123.12E-123 or -123.12e+123

Error message with highlight

Reference for interactive mode

--- Modes ---
STAY mode (prompt "===") (Default) save result by call "save" command
WALKING mode (prompt ">>>") automatically save results and move to next register

--- Commands ---
"exit" exit program.
"show" show all results in register.
"reset" clear all results in register.
"stay" switch to STAY mode.
"go" save result & switch to WALKING mode.
"save [tag]" save result (in STAY Mode).

--- Functions ---
sum(1, 2, 2+1)     => 6
max(1, sum(2, 1))  => 3
min(1, 2)          => 1
abs(1-12)          => 11
round(12.16, 1)    => 12.2
hex(10)            => 0xa
oct(10)            => 0o12
sqrt(1.44)         => 1.2
ln(exp(100))       => 10.0000000000
log(100)           => 2

Future Plans

add more function & operator, bugfix.