astropy correspond à combien d'extensions?

Question

Existe-t-il un moyen de voir le nombre d'extensions de votre fichier d'ajustement? Donc, si mon fichier ressemble à ceci, comment puis-je récupérer 309 sans ouvrir chaque image et faire exploser mon bélier?

Filename: a.fits 
No. Name   Type  Cards Dimensions Format 
0 PRIMARY  PrimaryHDU  828 ()    
1 CHIP1.HCYCLE11 ImageHDU  52 (1024, 900) float32 
2 CHIP1.HCYCLE21 ImageHDU  52 (1024, 900) float32 
3 CHIP1.HCYCLE12 ImageHDU  50 (1024, 900) float32 
4 CHIP1.HCYCLE22 ImageHDU  50 (1024, 900) float32 
5 CHIP1.HCYCLE13 ImageHDU  50 (1024, 900) float32 
6 CHIP1.HCYCLE23 ImageHDU  50 (1024, 900) float32 
7 CHIP1.HCYCLE14 ImageHDU  50 (1024, 900) float32 
8 CHIP1.HCYCLE24 ImageHDU  50 (1024, 900) float32 
9 CHIP1.HCYCLE15 ImageHDU  50 (1024, 900) float32 
10 CHIP1.HCYCLE25 ImageHDU  50 (1024, 900) float32 
11 CHIP1.HCYCLE16 ImageHDU  50 (1024, 900) float32 
12 CHIP1.HCYCLE26 ImageHDU  50 (1024, 900) float32 
13 CHIP1.HCYCLE17 ImageHDU  50 (1024, 900) float32 
14 CHIP1.HCYCLE27 ImageHDU  50 (1024, 900) float32 
15 CHIP1.HCYCLE18 ImageHDU  50 (1024, 900) float32 
16 CHIP1.HCYCLE28 ImageHDU  50 (1024, 900) float32 
17 CHIP1.HCYCLE19 ImageHDU  50 (1024, 900) float32 
18 CHIP1.HCYCLE29 ImageHDU  50 (1024, 900) float32 
19 CHIP1.HCYCLE110 ImageHDU  50 (1024, 900) float32 
20 CHIP1.HCYCLE210 ImageHDU  50 (1024, 900) float32 
21 CHIP1.HCYCLE111 ImageHDU  50 (1024, 900) float32 
22 CHIP1.HCYCLE211 ImageHDU  50 (1024, 900) float32 
23 CHIP1.HCYCLE112 ImageHDU  50 (1024, 900) float32 
24 CHIP1.HCYCLE212 ImageHDU  50 (1024, 900) float32 
25 CHIP1.HCYCLE113 ImageHDU  50 (1024, 900) float32 
26 CHIP1.HCYCLE213 ImageHDU  50 (1024, 900) float32 
27 CHIP1.HCYCLE114 ImageHDU  50 (1024, 900) float32 
28 CHIP1.HCYCLE214 ImageHDU  50 (1024, 900) float32 
29 CHIP1.HCYCLE115 ImageHDU  50 (1024, 900) float32 
30 CHIP1.HCYCLE215 ImageHDU  50 (1024, 900) float32 
31 CHIP1.HCYCLE116 ImageHDU  50 (1024, 900) float32 
32 CHIP1.HCYCLE216 ImageHDU  50 (1024, 900) float32 
33 CHIP1.HCYCLE117 ImageHDU  50 (1024, 900) float32 
34 CHIP1.HCYCLE217 ImageHDU  50 (1024, 900) float32 
35 CHIP1.HCYCLE118 ImageHDU  50 (1024, 900) float32 
36 CHIP1.HCYCLE218 ImageHDU  50 (1024, 900) float32 
37 CHIP1.HCYCLE119 ImageHDU  50 (1024, 900) float32 
38 CHIP1.HCYCLE219 ImageHDU  50 (1024, 900) float32 
39 CHIP1.HCYCLE120 ImageHDU  50 (1024, 900) float32 
40 CHIP1.HCYCLE220 ImageHDU  50 (1024, 900) float32 
41 CHIP1.HCYCLE121 ImageHDU  50 (1024, 900) float32 
42 CHIP1.HCYCLE221 ImageHDU  50 (1024, 900) float32 
43 CHIP1.HCYCLE122 ImageHDU  50 (1024, 900) float32 
44 CHIP1.HCYCLE222 ImageHDU  50 (1024, 900) float32 
45 CHIP1.HCYCLE123 ImageHDU  50 (1024, 900) float32 
46 CHIP1.HCYCLE223 ImageHDU  50 (1024, 900) float32 
47 CHIP1.HCYCLE124 ImageHDU  50 (1024, 900) float32 
48 CHIP1.HCYCLE224 ImageHDU  50 (1024, 900) float32 
49 CHIP1.HCYCLE125 ImageHDU  50 (1024, 900) float32 
50 CHIP1.HCYCLE225 ImageHDU  50 (1024, 900) float32 
51 CHIP1.HCYCLE126 ImageHDU  50 (1024, 900) float32 
52 CHIP1.HCYCLE226 ImageHDU  50 (1024, 900) float32 
53 CHIP1.HCYCLE127 ImageHDU  50 (1024, 900) float32 
54 CHIP1.HCYCLE227 ImageHDU  50 (1024, 900) float32 
55 CHIP1.HCYCLE128 ImageHDU  50 (1024, 900) float32 
56 CHIP1.HCYCLE228 ImageHDU  50 (1024, 900) float32 
57 CHIP1.HCYCLE129 ImageHDU  50 (1024, 900) float32 
58 CHIP1.HCYCLE229 ImageHDU  50 (1024, 900) float32 
59 CHIP1.HCYCLE130 ImageHDU  50 (1024, 900) float32 
60 CHIP1.HCYCLE230 ImageHDU  50 (1024, 900) float32 
61 CHIP1.HCYCLE131 ImageHDU  50 (1024, 900) float32 
62 CHIP1.HCYCLE231 ImageHDU  50 (1024, 900) float32 
63 CHIP1.HCYCLE132 ImageHDU  50 (1024, 900) float32 
64 CHIP1.HCYCLE232 ImageHDU  50 (1024, 900) float32 
65 CHIP1.HCYCLE133 ImageHDU  50 (1024, 900) float32 
66 CHIP1.HCYCLE233 ImageHDU  50 (1024, 900) float32 
67 CHIP1.HCYCLE134 ImageHDU  50 (1024, 900) float32 
68 CHIP1.HCYCLE234 ImageHDU  50 (1024, 900) float32 
69 CHIP1.HCYCLE135 ImageHDU  50 (1024, 900) float32 
70 CHIP1.HCYCLE235 ImageHDU  50 (1024, 900) float32 
71 CHIP1.HCYCLE136 ImageHDU  50 (1024, 900) float32 
72 CHIP1.HCYCLE236 ImageHDU  50 (1024, 900) float32 
73 CHIP1.HCYCLE137 ImageHDU  50 (1024, 900) float32 
74 CHIP1.HCYCLE237 ImageHDU  50 (1024, 900) float32 
75 CHIP1.HCYCLE138 ImageHDU  50 (1024, 900) float32 
76 CHIP1.HCYCLE238 ImageHDU  50 (1024, 900) float32 
77 CHIP1.HCYCLE139 ImageHDU  50 (1024, 900) float32 
78 CHIP1.HCYCLE239 ImageHDU  50 (1024, 900) float32 
79 CHIP1.HCYCLE140 ImageHDU  50 (1024, 900) float32 
80 CHIP1.HCYCLE240 ImageHDU  50 (1024, 900) float32 
81 CHIP1.HCYCLE141 ImageHDU  50 (1024, 900) float32 
82 CHIP1.HCYCLE241 ImageHDU  50 (1024, 900) float32 
83 CHIP1.HCYCLE142 ImageHDU  50 (1024, 900) float32 
84 CHIP1.HCYCLE242 ImageHDU  50 (1024, 900) float32 
85 CHIP1.HCYCLE143 ImageHDU  50 (1024, 900) float32 
86 CHIP1.HCYCLE243 ImageHDU  50 (1024, 900) float32 
87 CHIP1.HCYCLE144 ImageHDU  50 (1024, 900) float32 
88 CHIP1.HCYCLE244 ImageHDU  50 (1024, 900) float32 
89 CHIP1.HCYCLE145 ImageHDU  50 (1024, 900) float32 
90 CHIP1.HCYCLE245 ImageHDU  50 (1024, 900) float32 
91 CHIP1.HCYCLE146 ImageHDU  50 (1024, 900) float32 
92 CHIP1.HCYCLE246 ImageHDU  50 (1024, 900) float32 
93 CHIP1.HCYCLE147 ImageHDU  50 (1024, 900) float32 
94 CHIP1.HCYCLE247 ImageHDU  50 (1024, 900) float32 
95 CHIP1.HCYCLE148 ImageHDU  50 (1024, 900) float32 
96 CHIP1.HCYCLE248 ImageHDU  50 (1024, 900) float32 
97 CHIP1.HCYCLE149 ImageHDU  50 (1024, 900) float32 
98 CHIP1.HCYCLE249 ImageHDU  50 (1024, 900) float32 
99 CHIP1.HCYCLE150 ImageHDU  50 (1024, 900) float32 
100 CHIP1.HCYCLE250 ImageHDU  50 (1024, 900) float32 
101 CHIP1.HCYCLE151 ImageHDU  50 (1024, 900) float32 
102 CHIP1.HCYCLE251 ImageHDU  50 (1024, 900) float32 
103 CHIP1.HCYCLE152 ImageHDU  50 (1024, 900) float32 
104 CHIP1.HCYCLE252 ImageHDU  50 (1024, 900) float32 
105 CHIP1.HCYCLE153 ImageHDU  50 (1024, 900) float32 
106 CHIP1.HCYCLE253 ImageHDU  50 (1024, 900) float32 
107 CHIP1.HCYCLE154 ImageHDU  50 (1024, 900) float32 
108 CHIP1.HCYCLE254 ImageHDU  50 (1024, 900) float32 
109 CHIP1.HCYCLE155 ImageHDU  50 (1024, 900) float32 
110 CHIP1.HCYCLE255 ImageHDU  50 (1024, 900) float32 
111 CHIP1.HCYCLE156 ImageHDU  50 (1024, 900) float32 
112 CHIP1.HCYCLE256 ImageHDU  50 (1024, 900) float32 
113 CHIP1.HCYCLE157 ImageHDU  50 (1024, 900) float32 
114 CHIP1.HCYCLE257 ImageHDU  50 (1024, 900) float32 
115 CHIP1.HCYCLE158 ImageHDU  50 (1024, 900) float32 
116 CHIP1.HCYCLE258 ImageHDU  50 (1024, 900) float32 
117 CHIP1.HCYCLE159 ImageHDU  50 (1024, 900) float32 
118 CHIP1.HCYCLE259 ImageHDU  50 (1024, 900) float32 
119 CHIP1.HCYCLE160 ImageHDU  50 (1024, 900) float32 
120 CHIP1.HCYCLE260 ImageHDU  50 (1024, 900) float32 
121 CHIP1.HCYCLE161 ImageHDU  50 (1024, 900) float32 
122 CHIP1.HCYCLE261 ImageHDU  50 (1024, 900) float32 
123 CHIP1.HCYCLE162 ImageHDU  50 (1024, 900) float32 
124 CHIP1.HCYCLE262 ImageHDU  50 (1024, 900) float32 
125 CHIP1.HCYCLE163 ImageHDU  50 (1024, 900) float32 
126 CHIP1.HCYCLE263 ImageHDU  50 (1024, 900) float32 
127 CHIP1.HCYCLE164 ImageHDU  50 (1024, 900) float32 
128 CHIP1.HCYCLE264 ImageHDU  50 (1024, 900) float32 
129 CHIP1.HCYCLE165 ImageHDU  50 (1024, 900) float32 
130 CHIP1.HCYCLE265 ImageHDU  50 (1024, 900) float32 
131 CHIP1.HCYCLE166 ImageHDU  50 (1024, 900) float32 
132 CHIP1.HCYCLE266 ImageHDU  50 (1024, 900) float32 
133 CHIP1.HCYCLE167 ImageHDU  50 (1024, 900) float32 
134 CHIP1.HCYCLE267 ImageHDU  50 (1024, 900) float32 
135 CHIP1.HCYCLE168 ImageHDU  50 (1024, 900) float32 
136 CHIP1.HCYCLE268 ImageHDU  50 (1024, 900) float32 
137 CHIP1.HCYCLE169 ImageHDU  50 (1024, 900) float32 
138 CHIP1.HCYCLE269 ImageHDU  50 (1024, 900) float32 
139 CHIP1.HCYCLE170 ImageHDU  50 (1024, 900) float32 
140 CHIP1.HCYCLE270 ImageHDU  50 (1024, 900) float32 
141 CHIP1.HCYCLE171 ImageHDU  50 (1024, 900) float32 
142 CHIP1.HCYCLE271 ImageHDU  50 (1024, 900) float32 
143 CHIP1.HCYCLE172 ImageHDU  50 (1024, 900) float32 
144 CHIP1.HCYCLE272 ImageHDU  50 (1024, 900) float32 
145 CHIP1.HCYCLE173 ImageHDU  50 (1024, 900) float32 
146 CHIP1.HCYCLE273 ImageHDU  50 (1024, 900) float32 
147 CHIP1.HCYCLE174 ImageHDU  50 (1024, 900) float32 
148 CHIP1.HCYCLE274 ImageHDU  50 (1024, 900) float32 
149 CHIP1.HCYCLE175 ImageHDU  50 (1024, 900) float32 
150 CHIP1.HCYCLE275 ImageHDU  50 (1024, 900) float32 
151 CHIP1.HCYCLE176 ImageHDU  50 (1024, 900) float32 
152 CHIP1.HCYCLE276 ImageHDU  50 (1024, 900) float32 
153 CHIP1.HCYCLE177 ImageHDU  50 (1024, 900) float32 
154 CHIP1.HCYCLE277 ImageHDU  50 (1024, 900) float32 
155 CHIP1.HCYCLE178 ImageHDU  50 (1024, 900) float32 
156 CHIP1.HCYCLE278 ImageHDU  50 (1024, 900) float32 
157 CHIP1.HCYCLE179 ImageHDU  50 (1024, 900) float32 
158 CHIP1.HCYCLE279 ImageHDU  50 (1024, 900) float32 
159 CHIP1.HCYCLE180 ImageHDU  50 (1024, 900) float32 
160 CHIP1.HCYCLE280 ImageHDU  50 (1024, 900) float32 
161 CHIP1.HCYCLE181 ImageHDU  50 (1024, 900) float32 
162 CHIP1.HCYCLE281 ImageHDU  50 (1024, 900) float32 
163 CHIP1.HCYCLE182 ImageHDU  50 (1024, 900) float32 
164 CHIP1.HCYCLE282 ImageHDU  50 (1024, 900) float32 
165 CHIP1.HCYCLE183 ImageHDU  50 (1024, 900) float32 
166 CHIP1.HCYCLE283 ImageHDU  50 (1024, 900) float32 
167 CHIP1.HCYCLE184 ImageHDU  50 (1024, 900) float32 
168 CHIP1.HCYCLE284 ImageHDU  50 (1024, 900) float32 
169 CHIP1.HCYCLE185 ImageHDU  50 (1024, 900) float32 
170 CHIP1.HCYCLE285 ImageHDU  50 (1024, 900) float32 
171 CHIP1.HCYCLE186 ImageHDU  50 (1024, 900) float32 
172 CHIP1.HCYCLE286 ImageHDU  50 (1024, 900) float32 
173 CHIP1.HCYCLE187 ImageHDU  50 (1024, 900) float32 
174 CHIP1.HCYCLE287 ImageHDU  50 (1024, 900) float32 
175 CHIP1.HCYCLE188 ImageHDU  50 (1024, 900) float32 
176 CHIP1.HCYCLE288 ImageHDU  50 (1024, 900) float32 
177 CHIP1.HCYCLE189 ImageHDU  50 (1024, 900) float32 
178 CHIP1.HCYCLE289 ImageHDU  50 (1024, 900) float32 
179 CHIP1.HCYCLE190 ImageHDU  50 (1024, 900) float32 
180 CHIP1.HCYCLE290 ImageHDU  50 (1024, 900) float32 
181 CHIP1.HCYCLE191 ImageHDU  50 (1024, 900) float32 
182 CHIP1.HCYCLE291 ImageHDU  50 (1024, 900) float32 
183 CHIP1.HCYCLE192 ImageHDU  50 (1024, 900) float32 
184 CHIP1.HCYCLE292 ImageHDU  50 (1024, 900) float32 
185 CHIP1.HCYCLE193 ImageHDU  50 (1024, 900) float32 
186 CHIP1.HCYCLE293 ImageHDU  50 (1024, 900) float32 
187 CHIP1.HCYCLE194 ImageHDU  50 (1024, 900) float32 
188 CHIP1.HCYCLE294 ImageHDU  50 (1024, 900) float32 
189 CHIP1.HCYCLE195 ImageHDU  50 (1024, 900) float32 
190 CHIP1.HCYCLE295 ImageHDU  50 (1024, 900) float32 
191 CHIP1.HCYCLE196 ImageHDU  50 (1024, 900) float32 
192 CHIP1.HCYCLE296 ImageHDU  50 (1024, 900) float32 
193 CHIP1.HCYCLE197 ImageHDU  50 (1024, 900) float32 
194 CHIP1.HCYCLE297 ImageHDU  50 (1024, 900) float32 
195 CHIP1.HCYCLE198 ImageHDU  50 (1024, 900) float32 
196 CHIP1.HCYCLE298 ImageHDU  50 (1024, 900) float32 
197 CHIP1.HCYCLE199 ImageHDU  50 (1024, 900) float32 
198 CHIP1.HCYCLE299 ImageHDU  50 (1024, 900) float32 
199 CHIP1.HCYCLE1100 ImageHDU  50 (1024, 900) float32 
200 CHIP1.HCYCLE2100 ImageHDU  50 (1024, 900) float32 
201 CHIP1.HCYCLE1101 ImageHDU  50 (1024, 900) float32 
202 CHIP1.HCYCLE2101 ImageHDU  50 (1024, 900) float32 
203 CHIP1.HCYCLE1102 ImageHDU  50 (1024, 900) float32 
204 CHIP1.HCYCLE2102 ImageHDU  50 (1024, 900) float32 
205 CHIP1.HCYCLE1103 ImageHDU  50 (1024, 900) float32 
206 CHIP1.HCYCLE2103 ImageHDU  50 (1024, 900) float32 
207 CHIP1.HCYCLE1104 ImageHDU  50 (1024, 900) float32 
208 CHIP1.HCYCLE2104 ImageHDU  50 (1024, 900) float32 
209 CHIP1.HCYCLE1105 ImageHDU  50 (1024, 900) float32 
210 CHIP1.HCYCLE2105 ImageHDU  50 (1024, 900) float32 
211 CHIP1.HCYCLE1106 ImageHDU  50 (1024, 900) float32 
212 CHIP1.HCYCLE2106 ImageHDU  50 (1024, 900) float32 
213 CHIP1.HCYCLE1107 ImageHDU  50 (1024, 900) float32 
214 CHIP1.HCYCLE2107 ImageHDU  50 (1024, 900) float32 
215 CHIP1.HCYCLE1108 ImageHDU  50 (1024, 900) float32 
216 CHIP1.HCYCLE2108 ImageHDU  50 (1024, 900) float32 
217 CHIP1.HCYCLE1109 ImageHDU  50 (1024, 900) float32 
218 CHIP1.HCYCLE2109 ImageHDU  50 (1024, 900) float32 
219 CHIP1.HCYCLE1110 ImageHDU  50 (1024, 900) float32 
220 CHIP1.HCYCLE2110 ImageHDU  50 (1024, 900) float32 
221 CHIP1.HCYCLE1111 ImageHDU  50 (1024, 900) float32 
222 CHIP1.HCYCLE2111 ImageHDU  50 (1024, 900) float32 
223 CHIP1.HCYCLE1112 ImageHDU  50 (1024, 900) float32 
224 CHIP1.HCYCLE2112 ImageHDU  50 (1024, 900) float32 
225 CHIP1.HCYCLE1113 ImageHDU  50 (1024, 900) float32 
226 CHIP1.HCYCLE2113 ImageHDU  50 (1024, 900) float32 
227 CHIP1.HCYCLE1114 ImageHDU  50 (1024, 900) float32 
228 CHIP1.HCYCLE2114 ImageHDU  50 (1024, 900) float32 
229 CHIP1.HCYCLE1115 ImageHDU  50 (1024, 900) float32 
230 CHIP1.HCYCLE2115 ImageHDU  50 (1024, 900) float32 
231 CHIP1.HCYCLE1116 ImageHDU  50 (1024, 900) float32 
232 CHIP1.HCYCLE2116 ImageHDU  50 (1024, 900) float32 
233 CHIP1.HCYCLE1117 ImageHDU  50 (1024, 900) float32 
234 CHIP1.HCYCLE2117 ImageHDU  50 (1024, 900) float32 
235 CHIP1.HCYCLE1118 ImageHDU  50 (1024, 900) float32 
236 CHIP1.HCYCLE2118 ImageHDU  50 (1024, 900) float32 
237 CHIP1.HCYCLE1119 ImageHDU  50 (1024, 900) float32 
238 CHIP1.HCYCLE2119 ImageHDU  50 (1024, 900) float32 
239 CHIP1.HCYCLE1120 ImageHDU  50 (1024, 900) float32 
240 CHIP1.HCYCLE2120 ImageHDU  50 (1024, 900) float32 
241 CHIP1.HCYCLE1121 ImageHDU  50 (1024, 900) float32 
242 CHIP1.HCYCLE2121 ImageHDU  50 (1024, 900) float32 
243 CHIP1.HCYCLE1122 ImageHDU  50 (1024, 900) float32 
244 CHIP1.HCYCLE2122 ImageHDU  50 (1024, 900) float32 
245 CHIP1.HCYCLE1123 ImageHDU  50 (1024, 900) float32 
246 CHIP1.HCYCLE2123 ImageHDU  50 (1024, 900) float32 
247 CHIP1.HCYCLE1124 ImageHDU  50 (1024, 900) float32 
248 CHIP1.HCYCLE2124 ImageHDU  50 (1024, 900) float32 
249 CHIP1.HCYCLE1125 ImageHDU  50 (1024, 900) float32 
250 CHIP1.HCYCLE2125 ImageHDU  50 (1024, 900) float32 
251 CHIP1.HCYCLE1126 ImageHDU  50 (1024, 900) float32 
252 CHIP1.HCYCLE2126 ImageHDU  50 (1024, 900) float32 
253 CHIP1.HCYCLE1127 ImageHDU  50 (1024, 900) float32 
254 CHIP1.HCYCLE2127 ImageHDU  50 (1024, 900) float32 
255 CHIP1.HCYCLE1128 ImageHDU  50 (1024, 900) float32 
256 CHIP1.HCYCLE2128 ImageHDU  50 (1024, 900) float32 
257 CHIP1.HCYCLE1129 ImageHDU  50 (1024, 900) float32 
258 CHIP1.HCYCLE2129 ImageHDU  50 (1024, 900) float32 
259 CHIP1.HCYCLE1130 ImageHDU  50 (1024, 900) float32 
260 CHIP1.HCYCLE2130 ImageHDU  50 (1024, 900) float32 
261 CHIP1.HCYCLE1131 ImageHDU  50 (1024, 900) float32 
262 CHIP1.HCYCLE2131 ImageHDU  50 (1024, 900) float32 
263 CHIP1.HCYCLE1132 ImageHDU  50 (1024, 900) float32 
264 CHIP1.HCYCLE2132 ImageHDU  50 (1024, 900) float32 
265 CHIP1.HCYCLE1133 ImageHDU  50 (1024, 900) float32 
266 CHIP1.HCYCLE2133 ImageHDU  50 (1024, 900) float32 
267 CHIP1.HCYCLE1134 ImageHDU  50 (1024, 900) float32 
268 CHIP1.HCYCLE2134 ImageHDU  50 (1024, 900) float32 
269 CHIP1.HCYCLE1135 ImageHDU  50 (1024, 900) float32 
270 CHIP1.HCYCLE2135 ImageHDU  50 (1024, 900) float32 
271 CHIP1.HCYCLE1136 ImageHDU  50 (1024, 900) float32 
272 CHIP1.HCYCLE2136 ImageHDU  50 (1024, 900) float32 
273 CHIP1.HCYCLE1137 ImageHDU  50 (1024, 900) float32 
274 CHIP1.HCYCLE2137 ImageHDU  50 (1024, 900) float32 
275 CHIP1.HCYCLE1138 ImageHDU  50 (1024, 900) float32 
276 CHIP1.HCYCLE2138 ImageHDU  50 (1024, 900) float32 
277 CHIP1.HCYCLE1139 ImageHDU  50 (1024, 900) float32 
278 CHIP1.HCYCLE2139 ImageHDU  50 (1024, 900) float32 
279 CHIP1.HCYCLE1140 ImageHDU  50 (1024, 900) float32 
280 CHIP1.HCYCLE2140 ImageHDU  50 (1024, 900) float32 
281 CHIP1.HCYCLE1141 ImageHDU  50 (1024, 900) float32 
282 CHIP1.HCYCLE2141 ImageHDU  50 (1024, 900) float32 
283 CHIP1.HCYCLE1142 ImageHDU  50 (1024, 900) float32 
284 CHIP1.HCYCLE2142 ImageHDU  50 (1024, 900) float32 
285 CHIP1.HCYCLE1143 ImageHDU  50 (1024, 900) float32 
286 CHIP1.HCYCLE2143 ImageHDU  50 (1024, 900) float32 
287 CHIP1.HCYCLE1144 ImageHDU  50 (1024, 900) float32 
288 CHIP1.HCYCLE2144 ImageHDU  50 (1024, 900) float32 
289 CHIP1.HCYCLE1145 ImageHDU  50 (1024, 900) float32 
290 CHIP1.HCYCLE2145 ImageHDU  50 (1024, 900) float32 
291 CHIP1.HCYCLE1146 ImageHDU  50 (1024, 900) float32 
292 CHIP1.HCYCLE2146 ImageHDU  50 (1024, 900) float32 
293 CHIP1.HCYCLE1147 ImageHDU  50 (1024, 900) float32 
294 CHIP1.HCYCLE2147 ImageHDU  50 (1024, 900) float32 
295 CHIP1.HCYCLE1148 ImageHDU  50 (1024, 900) float32 
296 CHIP1.HCYCLE2148 ImageHDU  50 (1024, 900) float32 
297 CHIP1.HCYCLE1149 ImageHDU  50 (1024, 900) float32 
298 CHIP1.HCYCLE2149 ImageHDU  50 (1024, 900) float32 
299 CHIP1.HCYCLE1150 ImageHDU  50 (1024, 900) float32 
300 CHIP1.HCYCLE2150 ImageHDU  50 (1024, 900) float32 
301 CHIP1.HCYCLE1151 ImageHDU  50 (1024, 900) float32 
302 CHIP1.HCYCLE2151 ImageHDU  50 (1024, 900) float32 
303 CHIP1.HCYCLE1152 ImageHDU  50 (1024, 900) float32 
304 CHIP1.HCYCLE2152 ImageHDU  50 (1024, 900) float32 
305 CHIP1.HCYCLE1153 ImageHDU  50 (1024, 900) float32 
306 CHIP1.HCYCLE2153 ImageHDU  50 (1024, 900) float32 
307 CHIP1.HCYCLE1154 ImageHDU  50 (1024, 900) float32 
308 CHIP1.HCYCLE2154 ImageHDU  50 (1024, 900) float32 
309 CHIP1.INT1 ImageHDU  52 (1024, 900) float32 

Answer 1

Comment ouvrez-vous actuellement votre fichier? astropy.io.fits.open(...) va ouvrir le fichier sans exploser votre RAM, et de retourner un HDUList, qui est, comme son nom l'indique, une liste de HDU s (extensions). Obtenir la longueur de cette liste vous donne le nombre d'extensions (y compris la première/tête primaire):

len(astropy.io.fits.open(...)) 

---

Si vous avez un outil comme ag installé, vous pouvez utiliser quelque chose comme:

ag -c 'END\s{77}' ./Downloads/bayestar.fits 

puisque chaque HDU aura un en-tête qui nécessite le mot-clé END, et un remplissage à un multiple de 80 (2880, pour être précis). Notez que cela ne fonctionnera pas avec grep, mais ag et ack les deux fonctionnent.