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python pandas unique Python里unique()一用就报错?90%的人栽在数据格式上,别让Bug毁了你半天成果

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python pandas unique Python里unique()一用就报错?90%的人栽在数据格式上,别让Bug毁了你半天成果

写了好些与绘图等跟多类型有关联的科研作图系列内容, 像是散点图、有柱状图、箱线图以及热图这些, 在后台以及评论区域里, 常常会遭遇到具备重复性的一些问题。许多情形下, 并非是代码思路存在着问题, 而是环境、数据格式、字体设置或者包版本方面出现了问题。

将这篇文章做科研作图常见报错的汇总, 尽可能依照“报错表现、原因与解决办法”去梳理, 以方便往后能直接进行查找。

适用场景主要包括:

若是你平常主要将其用于, 制作论文配图, 绘制统计图, 进行结果展示, 那么这一篇应该会相对比较常用。

1. :找不到文件

最常见的报错之一就是:

: No such file or

例如:

file_path = r'F:\知乎\基础绘图\data.xlsx' df = pd.read_excel(file_path)

平常出现的缘由是, 文件所放置的路径被写错, 文件的名称被写错, 其中包括后缀名写错, 就像实际上是 .xls, 而在代码里面却写成了 .xlsx, 还有文件根本就不在这个文件夹当中。

解决办法

先去确认一下, 路径以及文件名是不是完全一样的, 特别要留意, 中文路径对不对, 斜杠写得正确不正确, 文件扩展名正不正确, 建议优先采用原始字符串。

file_path = r'F:\知乎\基础绘图\data.xlsx'

也可以先判断文件是否存在:

import os print(os.path.exists(file_path))

如果输出是 False,说明路径有问题。

2. : named xxx not found

比如说, 如果图表里明明清清楚楚、实实在在列着名为“散点图”, 可系统偏偏就是找不到它。

会常常出现的原因是, Excel工作表的名字写得不对, 表名之中存在空格, Excel内的真正名称与代码之间并不一样。

解决办法:

先把所有工作表名称打印出来:

import pandas as pd file_path = r'F:\知乎\基础绘图\data.xlsx' xls = pd.ExcelFile(file_path) print(xls.sheet_names)

然后复制正确的工作表名称再写进代码:

df = pd.read_excel(file_path, sheet_name='散点图')

3. :列名不存在

类如: 冒号加单引号“A”冒号加单引号, 冒号加单引号“处理1”冒号加单引号。

情况一, Excel列名与代码所写内容存在差异, 情况二, 列名之中含有空格, 情况三, 表头读取出现错误, 情况四, 读取时越过了错误的行数, 这些均为常见原因。

解决办法:

先查看实际列名:

print(df.columns)

如果发现列名里有空格,可以先统一处理:

df.columns = df.columns.str.strip()

倘若Excel的首行并非那种正规的表头, 那就需要去进行调整, 或者去变动参数。

例如:

df = pd.read_excel(file_path, sheet_name='箱线图', skiprows=0)

若依旧出现报错情况, 那么就着重去检查, Excel 的第一行究竟是不是变量名。

4. :缺少库

例如:: No named ''

: No named ''

: No named ''

常见原因:对应的包没有安装。

解决办法

根据报错安装相应的包:

pip install seaborn pip install openpyxl pip install statsmodels

如果你用的是 ,也可以:

conda install seaborn conda install openpyxl conda install statsmodels

其中比较常见的是:

5. : ''

例如:: ''

原因: 在读取 .xlsx 文件时,通常需要 支持。

解决办法

直接安装:

pip install openpyxl

安装后重新运行即可。

6. 中文显示成方框,或者中文乱码

此类问题并非必然直接出现报错情况, 不过在科研过程中绘制图形这件事情里面是极为常见的。图形能够被绘制成功呈现出来, 然而中文标题、坐标轴上面所标注的标签以及图例却呈现出显示不正常的状况。

普遍存在的缘由是, 未曾进行中文字体的设置, 现在所使用的这台电脑不存在与之相应的字体, 并且默认的字体对中文并不具备支持的能力。

解决办法:

常用设置如下:

import matplotlib.pyplot as plt plt.rcParams['font.family'] = ['Times New Roman', 'SimSun'] plt.rcParams['axes.unicode_minus'] = False

如果 不行,也可以试试:

plt.rcParams['font.sans-serif'] = ['SimHei'] plt.rcParams['axes.unicode_minus'] = False

这里顺便解释一下:

7. 负号显示异常

有时候图画出来了,但坐标轴上的负号不正常。

解决办法:

加上这一句:

plt.rcParams['axes.unicode_minus'] = False

常见原因

有字符串, 还有空格, 以及括号格式的数字掺和进了数据里, 致使整列变成了非纯数值型。

像是在Excel里, 有那种看上去好似数字的情况, 然而实际上呢, 是这样的: '0.56', 还有' (0.43)', 再就是'NA', 并且还有空字符串。

解决办法

先检查数据类型:

print(df.dtypes)

必要时把数据转成数值型:

df['A'] = pd.to_numeric(df['A'], errors='coerce') df['B'] = pd.to_numeric(df['B'], errors='coerce')

如果是热图这类整块矩阵数据,可以统一处理:

df.iloc[:, 1:] = df.iloc[:, 1:].apply(pd.to_numeric, errors='coerce')

遇见无法进行转换的值, 就会变成 NaN, 而这就是 “=''” 的意思。

9. : could not to float

和上一个问题很类似,本质上也是数据格式不规范。

常出现的原因是, 列里面混杂着文字, 数字带有单位, 存在括号、星号、空格这类符号, 该情况有其具备的原因。

例如:12.5%、3.6 mg、(0.45)、0.12**

解决办法

先把非数字字符清理掉,再转数值。

比如:

df['A'] = df['A'].astype(str).str.replace('%', '', regex=False) df['A'] = pd.to_numeric(df['A'], errors='coerce')

10. X, 和, Y, 必须, 是, 相同, 的, 尺寸。

例如画散点图时:

plt.scatter(x, y)

出现错误: , 即x以及y必须是相同的大小。

原因:x 和 y 的长度不一致。

解决办法:

先看长度:

print(len(x), len(y))

要是存在不一致的情况, 一般而言, 就是: 某一列存在空值, 在数据读取的时候遗漏掉了某些行, 经由手动切片致使长度不一样, 能够先统一将缺失值去除掉:

df = df[['A', 'B']].dropna() x = df['A'] y = df['B']

11. “不”, “和”它一起,“被发现”, “去放置在里面”。

例如:

ax.legend()

报出警告,但不一定停止运行。

原因:你调用了图例,但前面绘图对象没有设置 label。ShAre.rEaD.MnSte.CoM/Article/details/355932.sHtML
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