python pandas dataframe head() 什么都不显示
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python pandas dataframe head() displays nothing
提问by Lauref
I am new to using pandas and I just don't know what to do with this :
我是使用Pandas的新手，我只是不知道该怎么做：
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:
我正在使用蟒蛇。我已经（正确）安装了 anaconda。在我的文件中，我只是创建了一个 DataFrame（首先从 read_csv 导入它，然后手动重新创建它以确保这不是问题）。当我打印（数据框）时，它会打印：
km | price
0 | 240000 | 3650
[...]
23 | 61789 | 8290
When I do dataframe.info() I get this :
当我做 dataframe.info() 我得到这个：
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
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.
这是完美的。但是我尝试的任何其他简单功能都没有显示任何内容。我尝试了 dataframe.head()、dataframe['km']、dataframe[3:6] 等。没有错误，我的终端上只是一大碗空空如也。
Edit to add example code:
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"]
回答by Ryan
You have to use:
你必须使用：
print(dataframe.head())
print(dataframe['km'])
print(dataframe[3:6])
Without the print statement python is just selecting the data but not doing anything with it.
没有打印语句，python 只是选择数据，而不是对它做任何事情。
回答by Puikit Leung
You may expect this would show some row after seeing how other does. But this only appear only in terminal environment. Just like the above answer, you need an print() to show row while you are using ide
在看到其他人的表现后，您可能会期望这会显示一些行。但是这只出现在终端环境中。就像上面的答案一样，您在使用ide时需要一个 print() 来显示行
