Differences

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--- python:index [2012/11/21 07:41] – tkbletsc
+++ python:index [2014/07/19 22:04] – tkbletsc
@@ Line 11: / Line 11: @@
 <code=python>
+from datetime import datetime
+def timestamp(): return datetime.now().strftime("%Y%m%d-%H%M%S")
 def avg(v): return sum(v)/len(v)
 def stdev(v): return math.sqrt(sum(x*x for x in v) / len(v) - (avg(v) ** 2))
 def pct_diff(a,b): return (a/b)-1
 def product(L): return reduce(lambda x,y: x*y, L, 1)
+def ping(host,timeout=1):
+	ret = subprocess.call(['ping','-c1','-W',str(timeout),host],stdout=open('/dev/null', 'w'))
+	return ret==0
 from timeit import Timer
@@ Line 99: / Line 107: @@
 		# ... do stuff ...
 		throb()
+def recognize_type(v):
+    if re.match(r'\d+$',v):
+        return int(v)
+    if re.match(r'\d+\.\d*$',v):
+        return float(v)
+    return v
 </code>
+Parse tab-delimited tables, especially pasted from excel:
+<code=python>
+def recognize_type(v):
+    try: return float(v)
+    except ValueError: pass
+    try: return int(v)
+    except ValueError: pass
+    return v
+def parse_table(table_tsv, xform=recognize_type):
+    table_rows = table_tsv.strip().split("\n")
+    table = {}
+    col_headers = table_rows[0].split("\t")[1:]
+    row_headers = [x.split("\t")[0] for x in table_rows[1:]]
+    for row_header,row in zip(row_headers,table_rows[1:]):
+        values = row.split("\t")[1:]
+        table[row_header] = { 'name' : row_header }
+        for (col_header,value) in zip(col_headers,values):
+            if xform: value = xform(value)
+            table[row_header][col_header] = value
+    return (row_headers,col_headers,table)
+engines_tsv = """name	cost	mass	thrust	TWR	Isp_atm	Isp_vac
+LV-1R Liquid Fuel Engine	650	0.03	4	13.6	220	290
+O-10 MonoPropellant Engine	800	0.09	20	22.7	220	290
+Rockomax 24-77	480	0.09	20	22.7	250	300
+Rockomax Mark 55 Radial Mount Liquid Engine	850	0.9	120	13.6	290	320
+LV-1 Liquid Fuel Engine	350	0.03	4	13.6	220	290
+Rockomax 48-7S	300	0.1	30	30.6	300	350
+LV-T30 Liquid Fuel Engine	850	1.25	215	17.5	320	370
+LV-T45 Liquid Fuel Engine	950	1.5	200	13.6	320	370
+LV-909 Liquid Fuel Engine	750	0.5	50	10.2	300	390
+R.A.P.I.E.R. Engine	3600	1.75	175	10.2	320	360
+Toroidal Aerospike Rocket	3850	1.5	175	11.9	388	390
+Rockomax "Poodle" Liquid Engine	1600	2	220	11.2	270	390
+Rockomax "Mainsail" Liquid Engine	5650	6	1500	25.5	320	360
+Rockomax "Skipper" Liquid Engine	2850	3	650	22.1	320	370
+LV-N Atomic Rocket Motor	8700	2.25	60	2.7	220	800
+LFB KR-1x2	16400	10	2000	20.4	320	360
+Kerbodyne KR-2L Advanced Engine	20850	6.5	2500	39.2	320	380
+S3 KS-25x4 Engine Cluster	32400	9.75	3200	33.5	320	360
+"""
+(engine_names,fields,engines) = parse_table(engines_tsv, recognize_type)
+</code>