Python Speed Learning
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- るるみ もちやま
- 6 years ago
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1 Python Speed Learning 1 / 76
2 Python 2 1 $ python 1 >>> / 76
3 print : 1 print : ( ) 3 / 76
4 print : 1 print 1 2 print hello 3 print print 7/3 5 print abs(-5*4) 4 / 76
5 print : 1 print 1 2 print hello 3 print print 7/3 5 print abs(-5*4) : hello / 76
6 ,, (/) 7 / / / float(3) / 76
7 : 1 = : ( ; variable), 6 / 76
8 :?, python? 1 a = print a 3 b = a print b 5 a = a print a 7 / 76
9 :?, python? 1 a = print a 3 b = a print b 5 a = a print a : / 76
10 ... : 1 a = print a 3 print b 8 / 76
11 ... : 1 a = print a 3 print b : Traceback (most recent call last): 3 File "a.py", line 3, in <module> 4 print b 5 NameError: name b is not defined 8 / 76
12 :.,, ( ),., 1. : x, y, tanaka, Kouji Uehara, World Cup 2013 : J-League, hungry?, 4WD 9 / 76
13 : 1 def (,,...): : 10 / 76
14 : 1 # 2 def f(x, y): 3 a = x + y 4 return a * a 5 6 # ( ) 7 print f(10, 20) / 76
15 : 1 # 2 def f(x, y): 3 a = x + y 4 return a * a 5 6 # ( ) 7 print f(10, 20) + 30 : / 76
16 python, 1 def f(x, y): 2 a = x + y 3 return a * a 4 print f(10, 20) f ( ) 2 print. 1,f(10, 20) , f(10, 20) x=10, y=20 f 3 return : 1 return,, 12 / 76
17 :?, python? 1 def f(x, y): 2 print 1 3 print hello 13 / 76
18 :?, python? 1 def f(x, y): 2 print 1 3 print hello! 13 / 76
19 :? 1 def f(x, y): 2 print x 3 print y 4 return x + y 5 6 print f(10, 20) 14 / 76
20 :? 1 def f(x, y): 2 print x 3 print y 4 return x + y 5 6 print f(10, 20) / 76
21 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) 15 / 76
22 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) : None 15 / 76
23 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) : None (return ). return,,, None 15 / 76
24 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) / 76
25 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) + 30 : Traceback (most recent call last): 4 File "a.py", line 6, in <module> 5 TypeError: unsupported operand type(s) for +: NoneType and int 16 / 76
26 :? : 1 def f(x, y): 2 print x 3 print y 4 x + y 5 6 print f(10, 20) + 30 None, 30, : Traceback (most recent call last): 4 File "a.py", line 6, in <module> 5 TypeError: unsupported operand type(s) for +: NoneType and int 16 / 76
27 1 def f(x, y): 2 print hello 3 print bye 4 print 10 5 f(30, 40) 17 / 76
28 1 def f(x, y): 2 print hello 3 print bye 4 print 10 5 f(30, 40) hello 3 bye print hello, print bye f ( ) print 10 f f(30,40), print hello, print bye 17 / 76
29 Python 1 def f(x): 2 print x 3 print x+1 1 File "a.py", line 3 2 print x+1 3 ^ 4 IndentationError: unexpected indent 18 / 76
30 Python 1 print 10 2 def f(x): 3 print x 4 5 print 20 1 File "a.py", line 5 2 print 20 3 ^ 4 IndentationError: unindent does not match any outer indentation level 19 / 76
31 Emacs Emacs Python (xxx.py), Tab ( C-i), Tab, 20 / 76
32 1 def f(x): 2 print x 3 y = x return y * y 5 def g(x): 6 y = f(x + 1) 7 print x 8 return x + y 9 print g(10) 21 / 76
33 1 def f(x): 2 print x 3 y = x return y * y 5 def g(x): 6 y = f(x + 1) 7 print x 8 return x + y 9 print g(10) / 76
34 ,. : 1 def f(x, y): 2 return x - y 3 4 print f(2, 3) # x=2, y=3, x, y 1 print f(y=10, x=20), 22 / 76
35 ,, ( ) 1 def g(x, y=1): 2 return x - y 3 4 print g(2) # x=2, y=1 5 print g(x=2) # x=2, y=1 6 print g(2, 3) # x=2, y=3 7 print g(x=2, y=3) # x=2, y=3 8 print g(y=3) # NG x Visual Python, numpy, 23 / 76
36 : 1 def f(x): 2 print x 3 y = x return y * y 5 def g(x): 6 y = f(x + 1) 7 print x 8 return x + y 9 print g(10), f x (y) g x (y),?. ( ) ( ) 24 / 76
37 1 def f(x): 2 y = x f(10) 4 print y : 1 Traceback (most recent call last): 2 File "a.py", line 5, in <module> 3 print y 4 NameError: name y is not defined 25 / 76
38 ( ), 1 z = 10 2 def f(x): 3 return x + z 4 print f(20) 5 z = 30 6 print f(20) 26 / 76
39 ( ), 1 z = 10 2 def f(x): 3 return x + z 4 print f(20) 5 z = 30 6 print f(20) : , ( ) 26 / 76
40 import : 1 from import * : 27 / 76
41 import : 1 print cos(0.1) : 1 Traceback (most recent call last): 2 File "a.py", line 1, in <module> 3 print cos(0.1) 4 NameError: name cos is not defined : 1 from math import * # math import 2 print cos(0.1) : / 76
42 import : 1 from visual import * 2 sphere() : 29 / 76
43 import : 1 import : from import *,,. 1 import visual 2 visual.sphere(), OK, 30 / 76
44 Python Python Visual Python, Matplotlib, numpy? ( )? python, dir( ) 1 from visual import * 2 print dir(visual) 1 [ ALLOW_THREADS, BUFSIZE, sphere,... ] 31 / 76
45 print (print ) ( = ) (def...) return (return ) import (from import *) 32 / 76
46 , ( ) 33 / 76
47 for (1) ( ): 1 for in range(, ): : 1 for i in range(a, b): , i = a, a + 1,..., b 1,... : range( ) range(0, ) 34 / 76
48 for (1) : 1 1 for x in range(3, 7): 2 print x * x 35 / 76
49 for (1) : 1 1 for x in range(3, 7): 2 print x * x / 76
50 for (1) : 2 1 def hatena(n): 2 a = 1 3 for i in range(0, n): 4 a = 2 * a return a 6 print hatena(5) 36 / 76
51 for (1) : 2 1 def hatena(n): 2 a = 1 3 for i in range(0, n): 4 a = 2 * a return a 6 print hatena(5) / 76
52 for (1) : 3 1 def hatena(n): 2 s = 0 3 for i in range(0, n): 4 s = s + i * i 5 return s 6 print hatena(8) (n 1) 2 s = s + i i / 76
53 for (1) : 3 1 def hatena(n): 2 s = 0 3 for i in range(0, n): 4 s = s + i * i 5 return s 6 print hatena(8) (n 1) 2 s = s + i i / 76
54 if : 1 if 1: elif: 2: else: elif. elif, else: ( ) : 1 (0) ( 1...) 2 (0) 2 ( 2...) 38 / 76
55 if (1) 1 def one_two_many(x): 2 if x == 1: 3 return ikko 4 elif x == 2: 5 return niko 6 else: 7 return takusan 8 print one_two_many(2) 9 print one_two_many(3) 39 / 76
56 if (1) 1 def one_two_many(x): 2 if x == 1: 3 return ikko 4 elif x == 2: 5 return niko 6 else: 7 return takusan 8 print one_two_many(2) 9 print one_two_many(3) 1 niko 2 takusan 39 / 76
57 if (2) 1 def nabetsune(): 2 for i in range(1, 41): 3 if i % 3 == 0 or i % 10 == 3 or 30 < i < 40: 4 print i, "!!!!!" 5 else: 6 print i 7 8 nabetsune() 40 / 76
58 if (2) 1 def nabetsune(): 2 for i in range(1, 41): 3 if i % 3 == 0 or i % 10 == 3 or 30 < i < 40: 4 print i, "!!!!!" 5 else: 6 print i 7 8 nabetsune() !!! / 76
59 ,, (e.g.,,,,,,... ),, ( ) 41 / 76
60 : 1 [,,..., ] : ( ) 42 / 76
61 : 1 from math import * 2 x = 20 3 a = [ 1, 1+2, cos(0.0), x ] 4 print a 5 print len(a) # 6 print a[2] # 7 b = a + [ 1.2, 3.4 ] # 2 8 print b 9 c = [ a, a, a ] # 10 print c[1][2] # c 1 ( ) 2 1 [1, 3, 1.0, 20] [1, 3, 1.0, 20, 1.2, 3.4] / 76
62 :,,,,,, 1 def f(l): 2 return l[0] 3 4 print f([1,2,3]) 44 / 76
63 ,, 1 a = [ 2, 3, 5 ] 2 a.append(7) # 3 a[2] = 50 4 del a[1] # a[1]. 5 b = [ a, a, a ] 6 print b 7 a[2] = 30 # 8 print b 1 [[2, 50, 7], [2, 50, 7], [2, 50, 7]] 2 [[2, 30, 7], [2, 30, 7], [2, 30, 7]] 45 / 76
64 for : 1 [ for in range(, ) ], for ( ) : ( for in ) 46 / 76
65 : 1 >>> [ x * x for x in range(0, 5) ] 2 -> [0, 1, 4, 9, 16] 1 >>> sum([ x * x for x in range(0, 5) ]) 2 -> 30 1 s = [] 2 for x in range(0, 5): 3 s.append(x * x) 1 s = [] 2 for x in range(0, 5): 3 s += x * x ( : s += E s = s + E ) 47 / 76
66 : 1,,...,, 1 (,,..., ) :!, len(...) ( )...[...] ( ) ( ) 48 / 76
67 ,,, 1 a = (1.1, 2.2, 3.3) 2 a.append(4.4) # NG 3 del a[1] # NG 4 a[1] = 22 # NG 5 a = (4.4, 5.5) # OK 6 a = a + (6.6, 7.7) # OK 2, 49 / 76
68 1 def polar(x, y): 2 r = sqrt(x * x + y * y) 3 theta = atan2(y, x) 4 return (r,theta) 1 r,theta = polor(3, 4)? OK 1 [a0,a1,a2] = range(3,6) # a0=3, a1=4, a2=5 50 / 76
69 : 1 "... " """... """ 4....? ",. a = he greeted, "hi" b = "Obama s lecture" 3 (""", ),, len(...)...[...] / 76
70 : ( ) x, 1 print x,, 1 print "x = %s" % x 1 from math import * 2 y = cos(3.14) 3 print "cos(3.14) = %s" % y 52 / 76
71 : 2 2, % 1 from math import * 2 x = print "cos(%s) = %s" % (x, exp(x)) 53 / 76
72 :, 1 1 % 2, 1, 1 i %s, 2 i %s,, %s... %d : %9d :. 9 9 %f : %.3f :., 3 54 / 76
73 (1) Python,,, (visual vector, numpy ), Python 5 55 / 76
74 (2) Python,,, (, ),,, +, len, [...] numpy Visual Python vector, 56 / 76
75 for (2) : 1 for in : ,, range(a, b),,,,, range(a, b) [ a, a + 1,...b 1 ] 57 / 76
76 for (2) : 1 for x in [ 2, 3, 5 ]: 2 print x 3 for x in "hello": 4 print x h 5 e 6 l 7 l 8 o 58 / 76
77 for (2) 1 A = [ (0,1), (2,3), (4, 5) ] 2 for x,y in A: 3 print x + y / 76
78 for (2) : zip zip(x, Y ) for 1 X = [ 1, 2, 3 ] 2 Y = [ 1, 4, 9 ] 3 for x,y in zip(x, Y): 4 print x + y / 76
79 for (2) : enumerate enumerate(l) ( ; 0, 1, 2,... ) 1 def find_space(): 2 for i,c in enumerate("hello world"): 3 if c == : 4 return i 5 return / 76
80 while : (for ) break : for, while continue : for, while ( ), Python 4 62 / 76
81 : Python,, etc. 63 / 76
82 : 1 class : : ( ), 64 / 76
83 : 1 class nothing: 2 pass # 3 4 # nothing 5 m = nothing() 6 # ( ) 7 m.x = 10 8 m.y = 20 9 # 10 print m.x + m.y 11 # def take_nothing(n): 14 n.x = n.x take_nothing(m) 17 print m.x 65 / 76
84 : init, ( ) ( self ) 1 class baseball_team: 2 # 3 def init (self, name, manager, players): 4 self.name = name 5 self.manager = manager 6 self.players = players 7 # 8 def add_player(self, p): 9 self.players.append(p) 66 / 76
85 : 1 # -> init 2 r = baseball team("nipponham", "Kuriyama", 3 [ "Inaba", "Saito", "Takeda" ]) 4 print r.players 5 # 6 r.add player("ohtani") 7 print r.players 67 / 76
86 : 1 # -> init 2 r = baseball team("nipponham", "Kuriyama", 3 [ "Inaba", "Saito", "Takeda" ]) 4 print r.players 5 # 6 r.add player("ohtani") 7 print r.players 1 [ "Inaba", "Saito", "Takeda" ] 2 [ "Inaba", "Saito", "Takeda", "Ohtani" ] 67 / 76
87 ,,, Visual Python, numpy,,, (, ) (vector, sphere, + ) 1 center = vector(2, 3, 4) 2 s = sphere(pos=center) 3 s.pos = center + vector(1, 1, 1) 68 / 76
88 add (self, o), (+) x + y, x. add (y) 1 class vector: 2 def init (self, x, y, z): 3 self.x = x 4 self.y = y 5 self.z = z 6 def add (self, o): 7 return vector(self.x + o.x, self.y + o.y, 8 self.z + o.z) 9 10 u = vector(1,2,3) 11 v = u + vector(4, 5, 6) # u. add (vector(4, 5, 6)) 12 print v, sub, mul, div 69 / 76
89 Python, +, -, *,, Python, ( ), Visual Python vector ( ), numpy array, mat,,, vector, + 70 / 76
90 Visual Python 1 from visual import * 2 s1 = sphere(color=color.red) # 3 s2 = sphere(pos=vector(1.0, 2.0, 3.0), radius=0.1) 4 # s1, s2 5 rate(0.3) # 3.3 (0.3 / ) 6 # 7 s2.color = color.green # 8 rate(0.3) # 3.3 (0.3 / ) 9 s2.pos = s2.pos * vector(-1.0,-1.0,-1.0) # Visual Python sphere, (color, radius, pos ),,, OK (, s1.vel = ) 71 / 76
91 Visual Python 1 from visual import * 2 s1 = sphere(color=color.red) # 3 s2 = sphere(pos=vector(1.0, 2.0, 3.0), radius=0.1) 4 # s1, s2 5 rate(0.3) # 3.3 (0.3 / ) 6 # 7 s2.color = color.green # 8 rate(0.3) # 3.3 (0.3 / ) 9 s2.pos = s2.pos * vector(-1.0,-1.0,-1.0) # Visual Python vector 3 +, * 72 / 76
92 Visual Python vector 1 >>> from visual import * 2 >>> v = vector(1,2,3) 3 >>> v 4 vector(1, 2, 3) 5 >>> v[0] >>> v.x >>> 2 * v 10 vector(2, 4, 6) 11 >>> v + v 12 vector(2, 4, 6) 13 >>> dir(v) 14 [..., astuple, clear, comp, cross, diff_angle, dot, mag, mag2, norm, proj, rotate, x, y, z ] 73 / 76
93 Visual Python vector 1 >>> v.mag >>> v.mag >>> v.dot(v) # >>> v.norm() 8 vector( , , ) 9 >>> v.mag * v.norm() 10 vector(1, 2, 3) 11 >>> v.cross(vector(1,1,1)) # 12 vector(-1, 2, -1) 74 / 76
94 Visual Python 1 from visual import * 2 s1 = sphere(color=color.red) # 3 s2 = sphere(pos=vector(1.0, 2.0, 3.0), radius=0.1) 4 # s1, s2 5 rate(0.3) # 3.3 (0.3 / ) 6 # 7 s2.color = color.green # 8 rate(0.3) # 3.3 (0.3 / ) 9 s2.pos = s2.pos * vector(-1.0,-1.0,-1.0) # Visual Python rate(f),, f / ( 1/f ) rate, ( ) 75 / 76
95 ( ), Python, # 1 def main(): 2 # location of the pointmass 3 p = vector(1,2,3) 4 # the pointmass 5 s = sphere(pos=p) 6 # the spring 7 sp = helix(pos=p) 8..., 1 1 #! -*- coding: utf-8 -*- 76 / 76
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