python pandas dataframe head()什么都不显示 [英] python pandas dataframe head() displays nothing

问题描述

我是熊猫的新手，但我不知道该怎么做:

I am new to using pandas and I just don't know what to do with this :

我正在使用python.我已经(正确地)安装了蟒蛇.在我的文件中，我只是简单地创建了一个DataFrame(首先通过从read_csv导入它，然后手动重新创建它来确保这不是问题). 当我打印(数据框)时，它会打印:

I am using python. I have (properly) installed anaconda. In my file I simply create a DataFrame (first by importing it from read_csv, then recreating it by hand to make sure that was not the problem). When I do print (dataframe) it prints:

        km |  price
0  | 240000 |  3650

[...]

23  | 61789 |  8290

当我执行dataframe.info()时，我得到了这个信息:

When I do dataframe.info() I get this :

class 'pandas.core.frame.DataFrame'

Int64Index: 24 entries, 0 to 23

Data columns (total 2 columns):

km       24 non-null int64

price    24 non-null int64

dtypes: int64(2)

memory usage: 576.0 bytes

这是完美的.但是我尝试的任何其他简单功能都显示无".我尝试了dataframe.head()，dataframe ['km']，dataframe [3:6]等.没有错误，但是我的终端上一碗碗什么也没有.

Which is perfect. But any other simple function I try just displays NOTHING. I tried dataframe.head(), dataframe['km'], dataframe[3:6], etc. No errors, just a big bowl of nothing on my terminal.

编辑以添加示例代码:

import pandas as pd 
import numpy as np 
import matplotlib.pyplot as plt 
pd.set_option('max_columns', 50) 
#df=pd.read_csv('data.csv') 
data = {'km': [240000, 139800, 150500, 185530, 176000, 114800, 166800, 89000, 144500, 84000, 82029, 63060, 74000, 97500, 67000, 76025, 48235, 93000, 60949, 65674, 54000, 68500, 22899, 61789], 'price': [3650, 3800, 4400, 4450, 5250, 5350, 5800, 5990, 5999, 6200, 6390, 6390, 6600, 6800, 6800, 6900, 6900, 6990, 7490, 7555, 7990, 7990, 7990, 8290]} 
df = pd.DataFrame(data, columns=['km', 'price']) 
print (df) 
df.info() 
df[2:5] 
df["km"] 

推荐答案

您必须使用:

print(dataframe.head())
print(dataframe['km'])
print(dataframe[3:6])

没有打印语句，python只是选择数据，而不对它做任何事情.

Without the print statement python is just selecting the data but not doing anything with it.

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