small refactor + readme update

README.md

@@ -2,12 +2,15 @@
 
 This repository aim to be a collection of useful scripts when working on small electronic projects.  
 
+
+for input values, n, u or µ, m, k, M and G suffixes are accepted, respectively for nano, micro, milli, kilo, mega and giga.  
+The inputs are asked through CLI, when multiple values are possible they can be separated with commas or spaces.
+
 ---
 
 ## voltage\_divider.py
 #### input:
-(will ask the input through CLI if ran directly)
++ a list of resistors values  
-+ a list of resistors values (floats) separated by commas or spaces, accept K and M suffixes for kilo and mega ohms values.  
 *example: 10 50 47 100 5K 1M*
 + a desired ratio \(0 ≤ ratio ≤ 1\) for the voltage divider  
 *example: 0.4096*
@@ -15,3 +18,12 @@ This repository aim to be a collection of useful scripts when working on small e
 The 5 best resistor pairs (closest to the desired ratio).
 
 ---
+
+## parallel\_resistors.py
+#### input:
++ a list of resistors values
+#### output
++ the total resistance with the resistors connected in parallel
+
+---
+

parallel_resistors.py

@@ -1,9 +1,9 @@
 #!/bin/python
-from utils import parse_resistors
+from utils import parse_values
 
 def get_input():
     raw_input_resistors = input("Enter resistor values separated by spaces or commas: ")
-    resistors = parse_resistors(raw_input_resistors)
+    resistors = parse_values(raw_input_resistors)
     return resistors
 
 def calculate_resistance(resistors):

utils.py

@@ -1,7 +1,7 @@
 #!/bin/python
 import re
 
-def parse_resistors(raw_input):
+def parse_values(raw_input):
     values = []
     tokens = raw_input.replace(',', ' ').split()
 
@@ -15,12 +15,21 @@ def parse_resistors(raw_input):
             raise ValueError(f"Invalid component value '{token}' (must be positive)")
 
         suffix = match.group(2)
-        if suffix == 'K':
+        match suffix:
+            case "n":
+                multiplier = 1e-9
+            case "u" | "µ":
+                multiplier = 1e-6
+            case "m":
+                multiplier = 1e-3
+            case "k":
                 multiplier = 1e3
-        elif suffix == 'M':
+            case "M":
                 multiplier = 1e6
-        else:
+            case "G":
-            multiplier = 1.0
+                multiplier = 1e3
+            case _:
+                1.0
 
         values.append(number * multiplier)
 

voltage_divider.py

@@ -1,5 +1,5 @@
 #!/bin/python
-from utils import parse_resistors
+from utils import parse_values
 
 def find_bests(desired_ratio, resistors):
     # only keep the 5 best candidates
@@ -36,7 +36,7 @@ def get_ratio():
 
 def get_inputs():
     raw_input_resistors = input("Enter resistor values separated by spaces or commas: ")
-    resistors = parse_resistors(raw_input_resistors)
+    resistors = parse_values(raw_input_resistors)
     desired_ratio = get_ratio()
 
     return (resistors, desired_ratio)