首先,我们需要从用户那里获取一个字符串。你可以使用Python的input函数来实现这个步骤: str_input=input("请输入一个字符串: ") 1. 2. 判断字符串是否为数字 接下来,我们需要判断输入的字符串是否为数字。Python提供了isdigit方法来判断一个字符串是否只包含数字字符。我们可以使用这个方法来完成判断: ifstr_input....
import numpy as npfrom datetime import datetimeimport matplotlib.pyplot as pltdef datestr2num(s): #定义一个函数 return datetime.strptime(s.decode('ascii'),"%Y-%m-%d").date().weekday()opens,highs,lows,closes,vols = np.loadtxt('data036.csv',delimiter=',', usecols=(2,3,4,5,6),co...
但是这样操作一点都不pathnic。 另外如果要对每一列都操作,最好写一个函数。 还有一种就是用apply 稍微麻烦 def str2num(astr): return int(re.search(r'\d+', astr).group()) str2num(a) df['magic'].apply(str2num) df['magic2'] = df['magic'].apply(str2num) df['magic2'].max() 1. 2....
importnumpy as npfromdatetimeimportdatetimeimportmatplotlib.pyplot as pltimportsys,osdefdatestr2num(s):#定义一个函数returndatetime.strptime(s.decode('ascii'),"%Y-%m-%d").date().weekday() close,vol= np.loadtxt('data036.csv',delimiter=',', usecols=(5,6),converters={1:datestr2num},unpack=...
importnumpy as npfromdatetimeimportdatetimeimportmatplotlib.pyplot as pltdefdatestr2num(s):#定义一个函数returndatetime.strptime(s.decode('ascii'),"%Y-%m-%d").date().weekday() dates, opens, high, low, close,vol=np.loadtxt('data.csv',delimiter=',', usecols=(1,2,3,4,5,6), ...
import numpy as npfrom datetime import datetimeimport matplotlib.pyplot as pltdef datestr2num(s): #定义一个函数 return datetime.strptime(s.decode('ascii'),"%Y-%m-%d").date().weekday() opens,highs,lows,closes,vols = np.loadtxt('data036.csv',delimiter=',', usecols=(2,3,4,5,6),conv...
def str2num(x):try:return float(x)except:return None # 对dataframe中的每个元素应用转换函数 df =...
import numpy as npfrom datetime import datetimedef datestr2num(s): #定义一个函数 return datetime.strptime(s.decode('ascii'),"%Y-%m-%d").date().weekday()#decode('ascii') 将字符串s转化为ascii码#读取csv文件 ,将日期、开盘价、最低价、最高价、收盘价、成交量等全部读取dates, opens, high, ...
NumArray=str2num(LineString,comment=’#’) 将字符串中的所有非Double类型的字符全部替换成空格 以’#’开头直至行尾的内容被清空 返回一维numpy.array数组 代码语言:javascript 复制 importnumpyimportscipy defstr2num(LineString,comment='#'):from ioimportStringIOasStringIOimportre,numpy ...
)函数将字符串' 7.6'转换为整数。为了修复这个问题,我们可以修改str2num()函数,使用float()函数来...