我有以下csv结构:
'Country' '1960' '1961' '1962' AUS 450 567 723 NZ 125 320 IND 350 375 395 SL PAK 100 115 218
使用Python Pandas如何将上述结构转换(转置)为以下结构?
'Country' 'Year' 'Value' AUS 1960 450 AUS 1961 567 AUS 1962 723 NZ 1960 NZ 1961 125 ...
我尝试使用枢轴是徒劳的.
可以使用Microsoft Web浏览器对象将"Internet Explorer Web浏览器"嵌入Excel工作表中.如何在Excel工作表中嵌入谷歌浏览器或Firefox?
我有一个html文件,我想<meta>在使用python 的<head>&</head>标签之间插入一个标签.如果我在append模式下打开文件,如何<meta>到达要插入标签的相关位置?
我有一个DataFrame;
data = pd.DataFrame({
'A': [1,1,1,-1,1,1],
'B':['abc','def','ghi','jkl','mno','pqr']
})
data['A'].replace(1,2)
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回报;
0 2
1 2
2 2
3 -1
4 2
5 2
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但为什么不起作用data['A'].replace(1,"pos")?
我能够根据这样的列表元素过滤数据帧;
import pandas as pd
W1 = ['Animal','Ball','Cat','Derry','Element','Lapse','Animate this']
W2 = ['Krota','Catch','Yankee','Global','Zeb','Rat','Try']
df = pd.DataFrame({'W1':W1,'W2':W2})
l1 = ['Animal','Zeb','Q']
print df[df['W1'].isin(l1) | df['W2'].isin(l1)]
W1 W2
0 Animal Krota
4 Element Zeb
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但有没有办法通过应用正则表达式进行过滤; 对于前
l1 = ['An','Cat']
Intended result;
W1 W2
0 Animal Krota
1 Ball Catch
2 Cat Yankee
6 Animate this Try
Run Code Online (Sandbox Code Playgroud) 我正在使用python sqlite3.
该陈述获得记录5 - 14;
SELECT * FROM something LIMIT 5, 10;
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但是我怎么得到,让我们通过一个声明说出前五个和最后五个记录?
我将 Twitter 搜索 API 结果存储为 Excel VBA 字典。我想将字典写入文本文件。我怎么做?
从我打印的数据框中data['words'].values得到,
['from' 'fairest' 'creatures' 'we' 'desire' 'increase' nan 'that' 'thereby']
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当我像这样循环时,如何确定值是否为nan?
for w in data['words'].values:
check if w is nan ????
Run Code Online (Sandbox Code Playgroud) 在此 DataFrame 中,我想按“位置”分组并获得“分数”的总和,但我不希望“纬度”、“经度”和“年份”在此过程中受到影响;
sample = pd.DataFrame({'Location':['A','B','C','A','B','C'],
'Year':[2001,2002,2003,2001,2002,2003],
'Lat':[24,32,14,24,32,14],
'Long':[81,85,79,81,85,79],
'Score':[123,234,10,25,46,11]})
grouped = sample.groupby(['Location']).sum().reset_index()
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grouped 给我这个;
Location Lat Long Score Year
0 A 48 162 148 4002
1 B 64 170 280 4004
2 C 28 158 21 4006
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但我正在寻找这个结果;
Location Lat Long Score Year
0 A 24 81 148 2001
1 B 32 85 280 2002
2 C 12 79 21 2003
Run Code Online (Sandbox Code Playgroud) 当我尝试获取一个键的值时,我得到一个 'str' 对象没有属性 'get' 错误,该值又是字典的名称。我如何告诉 python 返回的字符串是一个字典?
choices = ['Country','State','Town']
chosen = 'Country'
country_color = {'Netherlands':'Red','Sweden':'Brown','Ukraine':'Yellow','China':'Pink','Japan':'Black'}
state_color = { .... }
town_color = { .... }
color_data = {'Country': ['col1','country_color'] ,'State': ['col2','state_color'] ,'Town': ['col3','town_color']}
.....
color1 = lambda v: country_color.get(v['col1']) # this works
color2 = lambda v: country_color.get(v[color_data.get(chosen)[0]]) # this too works
color3 = lambda v: color_data.get(chosen)[1].get(v[color_data.get(chosen)[0]]) # but this doesn't work; error - 'str' object has no attribute 'get'
....
Run Code Online (Sandbox Code Playgroud) 我有一个列表,看起来像这样;
[[4, 0, 1], [0, 0, 1], [0, 1, 2], [1, 1, 0], [2, 0, 0]]
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哪个是基于元素位置从上面的列表中获取3个列表的最有效方法?
结果:
[4,0,0,1,2]
[0,0,1,1,0]
[1,1,2,0,0]
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