Trees | Indices | Help |
---|
|
1 #!/usr/bin/env python 2 # 3 # Restriction Analysis Libraries. 4 # Copyright (C) 2004. Frederic Sohm. 5 # 6 # This code is part of the Biopython distribution and governed by its 7 # license. Please see the LICENSE file that should have been included 8 # as part of this package. 9 # 10 """ 11 Usage : 12 ===== 13 14 >>> from Rana.fts import fts # 15 >>> from Rana.Vector import * # Just a way to get a sequence. 16 >>> from Bio.Seq import Seq # Use your prefer method here. 17 >>> pbr = fts(pBR322) # 18 >>> seq = Seq(str(pbr)) # 19 >>> 20 >>> from Bio.Restriction import * 21 >>> a = Analysis(AllEnzymes, seq, linear=False) 22 >>> b = a.blunt() 23 >>> a.print_that() # no argument -> print all the results 24 AasI : 2169, 2582. 25 AatII : 4289. 26 Acc16I : 263, 1359, 1457, 3589. 27 ... 28 More enzymes here. 29 ... 30 >>> b = a.without_site() 31 >>> a.print_that(b, '', '\n Enzymes which do not cut pBR322.\n\n') 32 33 Enzymes which do not cut pBR322. 34 35 AarI AatI Acc65I AcsI AcvI AdeI AflII AgeI 36 AhlI AleI AloI ApaI ApoI AscI AsiAI AsiSI 37 Asp718I AspA2I AsuII AvaIII AvrII AxyI BaeI BbrPI 38 BbvCI BclI BcuI BfrBI BfrI BglII BlnI BlpI 39 BmgBI BmgI BplI Bpu1102I Bpu14I BsaXI Bse21I BsePI 40 BseRI BshTI BsiWI Bsp119I Bsp120I Bsp1407I Bsp1720I Bsp19I 41 BspT104I BspTI BsrGI BssHI BssHII Bst98I BstAUI BstBI 42 BstEII BstPI BstSNI BstXI Bsu36I BtrI CciNI CelII 43 Cfr42I Cfr9I CpoI Csp45I CspAI CspCI CspI DraIII 44 DrdII Ecl136II Eco105I Eco147I Eco72I Eco81I Eco91I EcoICRI 45 EcoO65I EcoRI EcoT22I EspI FalI FbaI FseI FunII 46 HpaI KpnI Ksp22I KspAI KspI MabI MfeI MluI 47 Mph1103I MspCI MssI MunI NcoI NotI NsiI NspV 48 OliI PacI PaeR7I PasI PauI PceI Pfl23II PinAI 49 PmaCI PmeI PmlI Ppu10I PsiI Psp124BI PspAI PspCI 50 PspEI PspLI PspOMI PspXI PsrI RleAI Rsr2I RsrII 51 SacI SacII SanDI SauI SbfI SciI SdaI SexAI 52 SfiI Sfr274I Sfr303I SfuI SgfI SgrBI SlaI SmaI 53 SmiI SnaBI SpeI SplI SrfI Sse232I Sse8387I Sse8647I 54 SseBI SspBI SstI StuI SunI SwaI TliI UthSI 55 Vha464I XapI XbaI XcmI XhoI XmaCI XmaI XmaJI 56 Zsp2I 57 58 >>> 59 """ 60 61 from Bio.Restriction.Restriction import * 62 # 63 # OK can't put the following code in Bio.Restriction.__init__ unless 64 # I put everything from Restriction in here. 65 # or at least the RestrictionBatch class. 66 # 67 # The reason for that is if I do that, I break the __contains__ method of 68 # the RestrictionBatch in Restriction, which expect to find the name of 69 # the enzymes in the locals() dictionary when evaluating string to see if 70 # it is an enzyme. 71 # 72 # This call for some explanations I guess : 73 # When testing for the presence of a Restriction enzyme in a 74 # RestrictionBatch, the user can use : 75 # 76 # 1) a class of type 'RestrictionType' 77 # 2) a string of the name of the enzyme (it's repr) 78 # i.e : 79 # >>> from Bio.Restriction import RestrictionBatch, EcoRI 80 # >>> MyBatch = RestrictionBatch(EcoRI) 81 # >>> #!/usr/bin/env python 82 # >>> EcoRI in MyBatch # the class EcoRI. 83 # True 84 # >>> 85 # >>> 'EcoRI' in MyBatch # a string representation 86 # True 87 # 88 # OK, that's how it is suppose to work. And I find it quite useful. 89 # 90 # Now if I leave the code here I got : 91 # >>> from Bio.Restriction import RestrictionBatch, EcoRI 92 # >>> MyBatch = RestrictionBatch(EcoRI) 93 # >>> EcoRI in MyBatch # the class EcoRI. 94 # True 95 # >>> 'EcoRI' in MyBatch # a string. 96 # False 97 98 # There is 5 ways to change that : 99 # 1) abandon the evaluation of string representation. 100 # 2) leave the code like that and hack something in RestrictionBatch. 101 # 3) Move back the code in Bio.Restriction.Restriction 102 # 4) Move RestrictionBatch here. 103 # 5) Remove Restriction.Restriction and move all the code in here 104 # 105 # 1) no fun in that. 106 # 2) there is a simpler way to do it. 107 # 3) I prefer to keep all the code together. 108 # 4) and 5) both are OK. Only a matter of preference. 109 # 110 # So the following code has been moved back to Bio.Restricion.Restriction 111 # For the user the results is transparent: 112 # from Bio.Restriction import * works as before. 113 # 114 115 ### 116 ### The restriction enzyme classes are created dynamically when the module is 117 ### imported. Here is the magic which allow the creation of the 118 ### restriction-enzyme classes. 119 ### 120 ### The reason for the two dictionaries in Restriction_Dictionary 121 ### one for the types (which will be called pseudo-type as they really 122 ### correspond to the values that instances of RestrictionType can take) 123 ### and one for the enzymes is efficiency as the bases are evaluated 124 ### once per pseudo-type. 125 ### 126 ### However Restriction is still a very inefficient module at import. But 127 ### remember that around 660 classes (which is more or less the size of Rebase) 128 ### have to be created dynamically. However, this processing take place only 129 ### once. 130 ### This inefficiency is however largely compensated by the use of metaclass 131 ### which provide a very efficient layout for the class themselves mostly 132 ### alleviating the need of if/else loops in the class methods. 133 ### 134 ### It is essential to run Restriction with doc string optimisation (-OO switch) 135 ### as the doc string of 660 classes take a lot of processing. 136 ### 137 ##CommOnly = RestrictionBatch() # commercial enzymes 138 ##NonComm = RestrictionBatch() # not available commercially 139 ##for TYPE, (bases, enzymes) in typedict.iteritems() : 140 ## # 141 ## # The keys are the pseudo-types TYPE (stored as type1, type2...) 142 ## # The names are not important and are only present to differentiate 143 ## # the keys in the dict. All the pseudo-types are in fact RestrictionType. 144 ## # These names will not be used after and the pseudo-types are not 145 ## # kept in the locals() dictionary. It is therefore impossible to 146 ## # import them. 147 ## # Now, if you have look at the dictionary, you will see that not all the 148 ## # types are present as those without corresponding enzymes have been 149 ## # removed by Dictionary_Builder(). 150 ## # 151 ## # The values are tuples which contain 152 ## # as first element a tuple of bases (as string) and 153 ## # as second element the names of the enzymes. 154 ## # 155 ## # First eval the bases. 156 ## # 157 ## bases = tuple([eval(x) for x in bases]) 158 ## # 159 ## # now create the particular value of RestrictionType for the classes 160 ## # in enzymes. 161 ## # 162 ## T = type.__new__(RestrictionType, 'RestrictionType', bases, {}) 163 ## for k in enzymes : 164 ## # 165 ## # Now, we go through all the enzymes and assign them their type. 166 ## # enzymedict[k] contains the values of the attributes for this 167 ## # particular class (self.site, self.ovhg,....). 168 ## # 169 ## newenz = T(k, bases, enzymedict[k]) 170 ## # 171 ## # we add the enzymes to the corresponding batch. 172 ## # 173 ## # No need to verify the enzyme is a RestrictionType -> add_nocheck 174 ## # 175 ## if newenz.is_comm() : CommOnly.add_nocheck(newenz) 176 ## else : NonComm.add_nocheck(newenz) 177 ### 178 ### AllEnzymes is a RestrictionBatch with all the enzymes from Rebase. 179 ### 180 ##AllEnzymes = CommOnly | NonComm 181 ### 182 ### Now, place the enzymes in locals so they can be imported. 183 ### 184 ##names = [str(x) for x in AllEnzymes] 185 ##locals().update(dict(map(None, names, AllEnzymes))) 186 ### 187 ### Limit what can be imported by from Restriction import * 188 ### Most of the classes here will never be used outside this module 189 ### (Defined,Palindromic...). It is still possible to request them specifically 190 ### 191 ### also delete the variable that are no longer needed. 192 ### 193 ### 194 ##__all__=['Analysis', 'RestrictionBatch','AllEnzymes','CommOnly','NonComm']+names 195 ##del k, x, enzymes, TYPE, bases, names 196
Trees | Indices | Help |
---|
Generated by Epydoc 3.0.1 on Tue Sep 22 19:33:41 2009 | http://epydoc.sourceforge.net |