Question

假设我有一个包含整数和float混合的列，我需要在该列中运行一个循环来检查所有值是否都是数值。非数字值，将该单元格的索引转储到空白列表中。

像这样的专栏：

DESCRIPTION                      RATE
79th St & Private Dr - 5022 W        1.5
79th St & Allison Ave                1.5
Allison Ave & 81st St                1
81st St & Norfolk St                 1
Norfolk St & Private Dr - 8178 N     1
Norfolk St & 84th St                 1
Moller Rd & 86th St                  1.5
Zionsville Rd & 86th St              1.5

我写了这样的代码，但是newlist循环不起作用。

import pandas as pd
import numpy as np

df = pd.read_csv("C:\\Python34\\python scripts\\BNSF\\data\\data.csv") #read csv
col=df.columns #read header
print(col)
r=df.shape[0] #gives number of row count
c=df.shape[1] #gives number of col count
print(r, c)
typ=df.dtypes
print(typ)

newlist=[] #creates blank list
for i in range(r,1):
    if df.iloc[i,1].dtype == np.int64:
        pass
    else:
        print(df.iloc[i,1])
        newlist.append(df.iloc[i,1])
        print(newlist)

需要在该循环内进行更改。请帮忙。

Answer 1

大熊猫的美妙之处在于你经常可以避免使用循环。可以通过执行模1操作并检查零等价%1==0来生成变量intcheck中的真/假值的数据帧来实现将数据分类为整数/非整数。然后只获取原始DataFrame中整数的True行。在前面放置~会反转布尔值以获得非整数值。

import pandas as pd

d =[["79th St & Private Dr - 5022 W"        ,1.5],
    ["79th St & Allison Ave"                ,1.5],
    ["Allison Ave & 81st St"                ,1  ],
    ["81st St & Norfolk St"                 ,1  ],
    ["Norfolk St & Private Dr - 8178 N"     ,1  ],
    ["Norfolk St & 84th St"                 ,1  ],
    ["Moller Rd & 86th St"                  ,1.5],
    ["Zionsville Rd & 86th St"              ,1.5]]

df = pd.DataFrame(d, columns=['DESCRIPTION','RATE'])
df = df.set_index('DESCRIPTION')

intcheck = (df.RATE%1)==0

print(df[intcheck])

#                                   RATE
# DESCRIPTION                           
# Allison Ave & 81st St              1.0
# 81st St & Norfolk St               1.0
# Norfolk St & Private Dr - 8178 N   1.0
# Norfolk St & 84th St               1.0

print(df[~intcheck])

#                                RATE
# DESCRIPTION                        
# 79th St & Private Dr - 5022 W   1.5
# 79th St & Allison Ave           1.5
# Moller Rd & 86th St             1.5
# Zionsville Rd & 86th St         1.5

检查列的每个值是否包含整数，如果不打印该单元格的索引

1 个答案: