用eval转换为字符串时报错: File"test.py", line 43,ind1 data=eval(infile.readline()) File"<string>", line 1,in<module>NameError: name'nan'isnotdefined 解决: globals ={'nan': 0 }#---data = eval(infile.readline(), globals) 参考资料: Python中,用eval强制将字符串转换为字典变量时候出错...
False >>res=float('NaN') False >>> isNaN(res) Traceback (most recent call last): File"<stdin>", line1,in<module> NameError: name'isNaN'isnotdefined 天哪!这个nan到底是什么类型! 最后突然想到了py自带的math库下面好像有一个判断nan的函数——isnan,抱着必死的心态,试了试: >>frommathimpo...
def dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw): """Serialize ``obj`` to a JSON formatted ``str``. If ``skipkeys`` is true then ``dict`` keys that are n...
# 定义类 class People: # 类属性 sex = 'nan' #构造函数：魔术方法 def _...
allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw):"""Serialize ``obj`` to a JSON formatted ``str``. If ``skipkeys`` is true then ``dict`` keys that are not basic types (``str``, ``int``, ``float``, ``bool``, ``None``) ...
▶ not knot! ▶ Half triple-quoted strings ▶ What's wrong with booleans? ▶ Class attributes and instance attributes ▶ yielding None ▶ Yielding from... return! * ▶ Nan-reflexivity * ▶ Mutating the immutable! ▶ The disappearing variable from outer scope ▶ The mysterious...
'isnan', 'isqrt', 'lcm', 'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'log2', 'modf', 'nan', 'nextafter', 'perm', 'pi', 'pow', 'prod', 'radians', 'remainder', 'sin', 'sinh', 'sqrt', 'tan', 'tanh',
The Python math.isnan() method is used to determine whether a given number NaN (Not a Number). It returns "True" if the number is NaN, and "False" otherwise.Generally, a number "x" is considered NaN if it does not represent a valid real number and cannot be expressed as a finite...
(time,lat,lon)float32 nan nan nan nan nan...nan nan nan nanAttributes:title:CPCUnified Gauge-Based AnalysisofDaily Precipitation o...Conventions:COARDSdescription:Gridded daily Precipitationplatform:ObservationsComments:Preciptation is accumulated from 12zofprevious day to1...history:originally ...
defcount_below(x, t):iflen(x)==0:returnnp.nanelse:returnnp.sum(x <= t) / len(x) #number of valleys = number_peaks(-x, n)defnumber_peaks(x, n):"""Calculates the number of peaks of at least support n in the time series x. ...