Python/pyfpdf:TypeError:列表索引必须是整数或切片，而不是str

Question

我正在尝试传递一个json数据并从中制作一个pdf文件。 我有这个代码片段可以正常工作：

data = [
['Power:',data["PowerS"],'MVA'],
['Voltage:',data["Voltage"],'V'],
['Impedance:',data["Impedance"],'ohms'],
['Current:',data["CurrentS"],'A'],
]

现在我尝试添加另一个与另一个相同的东西：

data2 = [['SC Power',str(data['SC Power']),'MVA'],
['Voltage Rating',str(data['Voltage Rating']),'V'],
['X/R',str(data['X/RS']),'']
]

该错误表明列表data2我认为与列表data相同。我错过了什么吗？

这是我的代码：

# Import FPDF class
from fpdf import FPDF
import datetime
import json
# Create instance of FPDF class
# Letter size paper, use inches as unit of measure
pdf=FPDF(format='A4', unit='in')
date = datetime.date.today()
file_name = ''
project_Title = ''
class CustomPDF(FPDF):
# def __init__(self,filename,projectTitle):
#     self.filename = filename
#     self.projectTitle = projectTitle
def header(self):
# Remember to always put one of these at least once.
epw = self.w - 2*self.l_margin
self.set_margins(25,25,25)
self.add_font('Calibri', '', 'calibri.ttf', uni=True)
self.add_font('Calibri', 'I', 'calibrii.ttf',uni = True)
self.add_font('Calibri', 'B', 'calibrib.ttf', uni = True)
self.set_font('Calibri','B',12.0) 
self.cell(epw, 5.5, 'Project Title: '+ str(project_Title), ln=1)
self.cell(epw, 5.5, 'File Name: '+ str(file_name), ln=1)
self.cell(epw, 5.5, 'Total No. of Bus: 1', ln=1)
self.cell(epw, 5.5, 'Date: '+str(date), ln=1)
self.cell(epw, 5.5, 'Page No: ' + str(self.page_no()), ln=1)
self.line(26, 57, 184, 57)
self.set_line_width(1)
# Line break
self.ln(10)
def footer(self):
self.set_y(-32)
self.set_font('Calibri', '', 12)
epw = self.w - 2*self.l_margin
self.line(26, 265, 184, 265)
self.cell(epw, 5.5, 'SCVD Analyzer 2020', ln=1)
def createPDF(jsn):
data = json.loads(jsn)
filename = data["Filename"]
projectTitle = data["Project Title"]
global file_name
global project_Title
file_name = filename
project_Title = projectTitle
pdf = CustomPDF()
# Create the special value {nb}
pdf.set_margins(25,25,25)
pdf.alias_nb_pages()
pdf.set_auto_page_break(True, 25)
pdf.add_page()
pdf.add_font('Calibri', '', 'calibri.ttf', uni=True)
pdf.add_font('Calibri', 'I', 'calibrii.ttf',uni = True)
pdf.add_font('Calibri', 'B', 'calibrib.ttf', uni = True)
epw = pdf.w - 2*pdf.l_margin
col_width = epw/4
pdf.set_font('Calibri','B',12.0) 
pdf.cell(epw, 5.5, "BASE VALUES",ln=1)
pdf.set_font('Calibri','',12.0)
data = [
['Power:',data["PowerS"],'MVA'],
['Voltage:',data["Voltage"],'V'],
['Impedance:',data["Impedance"],'ohms'],
['Current:',data["CurrentS"],'A'],
]
th = pdf.font_size
for row in data:
for datum in row:
pdf.cell(50, 5.5, str(datum), border=0, align='C')
pdf.ln(th)
pdf.set_font('Calibri','B',12.0) 
pdf.cell(epw, 5.5, "EQUIPMENT PARAMETERS",ln=1)
pdf.cell(epw, 5.5, "Utility",ln=1)
data2 = [['SC Power',str(data['SC Power']),'MVA'],
['Voltage Rating',str(data['Voltage Rating']),'V'],
['X/R',str(data['X/RS']),'']
]
for row in data2:
for datum in row:
pdf.cell(50, 5.5, str(datum), border=0, align='C')
pdf.ln(th)
pdf.cell(epw, 5.5, "Utility",ln=1)

pdf.output(filename+".pdf")
if __name__ == '__main__':
x = {'Filename': 'test111', 
'Project Title': '123', 
'PowerS': '100.00', 
'Voltage': '12000', 
'Impedance': '1.44', 
'CurrentS': '8333.3333', 
'SC Power':'123', 
'Voltage Rating': '12000', 
'X/RS': '123123'}
# convert into JSON:
y = json.dumps(x)
# the result is a JSON string:
print(y)
createPDF(y)

任何帮助都非常感谢。

Answer 1

您的data是list对象，无法像data["PowerS"]一样访问。 您必须使用整数或切片作为索引，如下所示：

>>> data = [
['Power:',data["PowerS"],'MVA'],
['Voltage:',data["Voltage"],'V'],
['Impedance:',data["Impedance"],'ohms'],
['Current:',data["CurrentS"],'A'],
]
>>> print(data[0][0])
'Power:'
>>> print(data[1][0])
'Voltage:'

如果要将其作为字符串键访问，则可以像这样使用dictionary对象：

data2 = {
'Power': [data[0][1],'MVA'],
'Voltage': [data[1][1],'V'],
'Impedance': [data[2][1],'ohms'],
'Current': [data[3][1],'A'],
}