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python:index [2014/07/20 17:48] – tkbletscpython:index [2024/07/09 07:28] (current) – tkbletsc
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 ====== Python ====== ====== Python ======
  
-  * [[Colorization and tab completion for the python shell]]  +  * [[:Python virtual environment recipe|]] 
-  * [[Defer to another program in the PATH, if available]] +  * [[:python:colorization_and_tab_completion_for_the_python_shell|Colorization and tab completion for the python shell]] 
-  * [[SOCKSv4 proxy]] - Simple proxy in pure python. +  * [[:python:defer_to_another_program_in_the_path_if_available|Defer to another program in the PATH, if available]] 
-  * [[virtualenv]] - A recipe to download and deploy Python 2.7 in your home directory without dependencies (except gcc) +  * [[:python:socksv4_proxy|SOCKSv4 proxy]] - Simple proxy in pure python. 
-  * [[optparse]] +  * [[:python:virtualenv|]] - A recipe to download and deploy Python 2.7 in your home directory without dependencies (except gcc) 
-  * [[IntVectorRange]] +  * [[:python:optparse|]] 
-  * [[Progress bar]] +  * [[:python:intvectorrange|IntVectorRange]] 
-  * [[Simple DynDNS updater]]+  * [[:python:progress_bar|Progress bar]] 
 +  * [[:python:simple_dyndns_updater|Simple DynDNS updater]]
  
-<code=python>+<code python>
 # use this like a dictonary (d['thing']) OR an object (d.thing) # use this like a dictonary (d['thing']) OR an object (d.thing)
 class DictObject(dict): class DictObject(dict):
     def __getattribute__(self,k): return self[k]     def __getattribute__(self,k): return self[k]
     def __setattribute__(self,k,v): self[k]=v     def __setattribute__(self,k,v): self[k]=v
- 
  
 from datetime import datetime from datetime import datetime
Line 26: Line 26:
  
 def ping(host,timeout=1): def ping(host,timeout=1):
- ret = subprocess.call(['ping','-c1','-W',str(timeout),host],stdout=open('/dev/null', 'w')) +    ret = subprocess.call(['ping','-c1','-W',str(timeout),host],stdout=open('/dev/null', 'w')) 
- return ret==0 +    return ret==0
  
 from timeit import Timer from timeit import Timer
Line 35: Line 34:
  
 def shred_unicode(s): def shred_unicode(s):
- return unicodedata.normalize('NFKD', s.decode("utf-8")).encode('ascii','ignore')+    return unicodedata.normalize('NFKD', s.decode("utf-8")).encode('ascii','ignore')
  
-# divide a list into equal pieces.  +# divide a list into equal pieces.
 # chunk ranges from 0 to num_chunks-1 # chunk ranges from 0 to num_chunks-1
 def divide_list(lst,chunk,num_chunks): def divide_list(lst,chunk,num_chunks):
- i = int( float(chunk)/num_chunks*len(lst) ) +    i = int( float(chunk)/num_chunks*len(lst) ) 
- j = int( float(chunk+1)/num_chunks*len(lst) )-1 +    j = int( float(chunk+1)/num_chunks*len(lst) )-1 
- return lst[i:j]+    return lst[i:j]
  
 import itertools import itertools
 def sliding_window(seq, n=2, pad_value=None, pad_left=0, pad_right=0): def sliding_window(seq, n=2, pad_value=None, pad_left=0, pad_right=0):
- "Returns a sliding window (of width n) over data from the iterable." +    "Returns a sliding window (of width n) over data from the iterable." 
- "Can optionally pad the window left and right." +    "Can optionally pad the window left and right." 
- it = itertools.chain( +    it = itertools.chain( 
- itertools.repeat(pad_value,pad_left),  +        itertools.repeat(pad_value,pad_left), 
- seq,  +        seq, 
- itertools.repeat(pad_value,pad_right), +        itertools.repeat(pad_value,pad_right), 
- ) +    ) 
- #it = iter(seq) +    #it = iter(seq) 
- result = tuple(itertools.islice(it, n)) +    result = tuple(itertools.islice(it, n)) 
- if len(result) == n: +    if len(result) == n: 
- yield result     +        yield result 
- for elem in it: +    for elem in it: 
- result = result[1:] + (elem,) +        result = result[1:] + (elem,) 
- yield result+        yield result
  
 def open_dash(filename,mode='r',bufsize=-1): def open_dash(filename,mode='r',bufsize=-1):
- if filename == '-': +    if filename == '-': 
- if 'w' in mode  or  'a' in mode: return sys.stdout +        if 'w' in mode  or  'a' in mode: return sys.stdout 
- elif 'r' in mode:                return sys.stdin +        elif 'r' in mode:                return sys.stdin 
- else:                            raise Exception("Bad mode") +        else:                            raise Exception("Bad mode") 
- else: +    else: 
- return open(filename,mode,bufsize)+        return open(filename,mode,bufsize)
  
 # allows you to put color codes in backticks and have them turned into escape codes # allows you to put color codes in backticks and have them turned into escape codes
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 heuristics = {} heuristics = {}
 def heuristic(func): def heuristic(func):
- name = func.__name__.replace('gadget_is_','').replace('gadget_','').replace('_','-') +    name = func.__name__.replace('gadget_is_','').replace('gadget_','').replace('_','-') 
- heuristics[name]=func +    heuristics[name]=func 
- return func+    return func
  
 # unlike set(), this is order preserving # unlike set(), this is order preserving
-def uniq(seq, idfunc=None):  +def uniq(seq, idfunc=None): 
- seen = set() +    seen = set() 
- for item in seq: +    for item in seq: 
- marker = idfunc(item) if idfunc else item +        marker = idfunc(item) if idfunc else item 
- if marker not in seen:  +        if marker not in seen: 
- seen.add(marker) +            seen.add(marker) 
- yield item+            yield item 
  
 </code> </code>
  
 Drop into python shell: Drop into python shell:
-<code=python>+ 
 +<code python>
 import code import code
 code.interact(local=locals()) code.interact(local=locals())
 +
 </code> </code>
  
-<code=python>+<code python>
 class ConsoleThrobber(object): class ConsoleThrobber(object):
- def __init__(self,chars='/\\'): +    def __init__(self,chars='/\\'): 
- self.chars=chars +        self.chars=chars 
- self.i=0 +        self.i=0 
- def __call__(self): +    def __call__(self): 
- sys.stdout.write("\r" + self.chars[self.i]) +        sys.stdout.write("\r" + self.chars[self.i]) 
- sys.stdout.flush() +        sys.stdout.flush() 
- self.i = (self.i + 1) % len(self.chars)+        self.i = (self.i + 1) % len(self.chars)
  
 def workload(): def workload():
- throb = ConsoleThrobber("\\|/-") +    throb = ConsoleThrobber("\\|/-") 
- while True: +    while True: 
- # ... do stuff ... +        # ... do stuff ... 
- throb() +        throb()
- +
  
 def recognize_type(v): def recognize_type(v):
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         return float(v)         return float(v)
     return v     return v
 +
 </code> </code>
  
 Parse tab-delimited tables, especially pasted from excel: Parse tab-delimited tables, especially pasted from excel:
  
-<code=python>+<code python>
 def recognize_type(v): def recognize_type(v):
     try: return float(v)     try: return float(v)
     except ValueError: pass     except ValueError: pass
-    +
     try: return int(v)     try: return int(v)
     except ValueError: pass     except ValueError: pass
-    +
     return v     return v
-    +
 def parse_table(table_tsv, xform=recognize_type): def parse_table(table_tsv, xform=recognize_type):
     table_rows = table_tsv.strip().split("\n")     table_rows = table_tsv.strip().split("\n")
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     return (row_headers,col_headers,table)     return (row_headers,col_headers,table)
  
- +engines_tsv = """name    cost    mass    thrust    TWR    Isp_atm    Isp_vac 
-engines_tsv = """name cost mass thrust TWR Isp_atm Isp_vac +LV-1R Liquid Fuel Engine    650    0.03    4    13.6    220    290 
-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 
-O-10 MonoPropellant Engine 800 0.09 20 22.7 220 290 +Rockomax 24-77    480    0.09    20    22.7    250    300 
-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 
-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 
-LV-1 Liquid Fuel Engine 350 0.03 4 13.6 220 290 +Rockomax 48-7S    300    0.1    30    30.6    300    350 
-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-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-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 
-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 
-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 
-Toroidal Aerospike Rocket 3850 1.5 175 11.9 388 390 +Rockomax "Poodle" Liquid Engine    1600    2    220    11.2    270    390 
-Rockomax "Poodle" Liquid Engine 1600 2 220 11.2 270 390 +Rockomax "Mainsail" Liquid Engine    5650    6    1500    25.5    320    360 
-Rockomax "Mainsail" Liquid Engine 5650 6 1500 25.5 320 360 +Rockomax "Skipper" Liquid Engine    2850    3    650    22.1    320    370 
-Rockomax "Skipper" Liquid Engine 2850 3 650 22.1 320 370 +LV-N Atomic Rocket Motor    8700    2.25    60    2.7    220    800 
-LV-N Atomic Rocket Motor 8700 2.25 60 2.7 220 800 +LFB KR-1x2    16400    10    2000    20.4    320    360 
-LFB KR-1x2 16400 10 2000 20.4 320 360 +Kerbodyne KR-2L Advanced Engine    20850    6.5    2500    39.2    320    380 
-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
-S3 KS-25x4 Engine Cluster 32400 9.75 3200 33.5 320 360+
 """ """
  
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 +</code>
  
-</code> 
  
python/index.1405903722.txt.gz · Last modified: 2014/07/20 17:48 by tkbletsc
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