Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/networkx/exception.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 """
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2 **********
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3 Exceptions
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4 **********
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5
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6 Base exceptions and errors for NetworkX.
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7 """
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8
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9 __all__ = [
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10 "HasACycle",
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11 "NodeNotFound",
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12 "PowerIterationFailedConvergence",
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13 "ExceededMaxIterations",
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14 "AmbiguousSolution",
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15 "NetworkXAlgorithmError",
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16 "NetworkXException",
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17 "NetworkXError",
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18 "NetworkXNoCycle",
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19 "NetworkXNoPath",
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20 "NetworkXNotImplemented",
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21 "NetworkXPointlessConcept",
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22 "NetworkXUnbounded",
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23 "NetworkXUnfeasible",
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24 ]
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25
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26
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27 class NetworkXException(Exception):
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28 """Base class for exceptions in NetworkX."""
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29
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30
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31 class NetworkXError(NetworkXException):
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32 """Exception for a serious error in NetworkX"""
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33
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34
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35 class NetworkXPointlessConcept(NetworkXException):
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36 """Raised when a null graph is provided as input to an algorithm
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37 that cannot use it.
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38
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39 The null graph is sometimes considered a pointless concept [1]_,
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40 thus the name of the exception.
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41
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42 References
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43 ----------
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44 .. [1] Harary, F. and Read, R. "Is the Null Graph a Pointless
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45 Concept?" In Graphs and Combinatorics Conference, George
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46 Washington University. New York: Springer-Verlag, 1973.
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47
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48 """
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49
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50
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51 class NetworkXAlgorithmError(NetworkXException):
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52 """Exception for unexpected termination of algorithms."""
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53
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54
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55 class NetworkXUnfeasible(NetworkXAlgorithmError):
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56 """Exception raised by algorithms trying to solve a problem
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57 instance that has no feasible solution."""
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58
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59
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60 class NetworkXNoPath(NetworkXUnfeasible):
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61 """Exception for algorithms that should return a path when running
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62 on graphs where such a path does not exist."""
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63
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64
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65 class NetworkXNoCycle(NetworkXUnfeasible):
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66 """Exception for algorithms that should return a cycle when running
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67 on graphs where such a cycle does not exist."""
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68
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69
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70 class HasACycle(NetworkXException):
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71 """Raised if a graph has a cycle when an algorithm expects that it
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72 will have no cycles.
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73
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74 """
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75
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76
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77 class NetworkXUnbounded(NetworkXAlgorithmError):
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78 """Exception raised by algorithms trying to solve a maximization
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79 or a minimization problem instance that is unbounded."""
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80
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81
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82 class NetworkXNotImplemented(NetworkXException):
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83 """Exception raised by algorithms not implemented for a type of graph."""
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84
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85
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86 class NodeNotFound(NetworkXException):
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87 """Exception raised if requested node is not present in the graph"""
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88
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89
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90 class AmbiguousSolution(NetworkXException):
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91 """Raised if more than one valid solution exists for an intermediary step
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92 of an algorithm.
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93
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94 In the face of ambiguity, refuse the temptation to guess.
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95 This may occur, for example, when trying to determine the
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96 bipartite node sets in a disconnected bipartite graph when
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97 computing bipartite matchings.
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98
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99 """
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100
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101
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102 class ExceededMaxIterations(NetworkXException):
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103 """Raised if a loop iterates too many times without breaking.
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104
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105 This may occur, for example, in an algorithm that computes
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106 progressively better approximations to a value but exceeds an
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107 iteration bound specified by the user.
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108
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109 """
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110
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111
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112 class PowerIterationFailedConvergence(ExceededMaxIterations):
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113 """Raised when the power iteration method fails to converge within a
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114 specified iteration limit.
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115
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116 `num_iterations` is the number of iterations that have been
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117 completed when this exception was raised.
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118
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119 """
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120
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121 def __init__(self, num_iterations, *args, **kw):
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122 msg = f"power iteration failed to converge within {num_iterations} iterations"
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123 exception_message = msg
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124 superinit = super().__init__
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125 superinit(self, exception_message, *args, **kw)