【发布时间】：2020-09-20 08:06:55
【问题描述】：
我创建了一个 Python Flask 应用程序。它读取 salary.csv 文件并从该文件中输出一些数据。现在，只要salary.csv 文件位于app.py 所在的同一文件夹中，我的应用程序就可以正常工作。但是如果我在同一个文件夹中没有salary.csv 并尝试上传它，它会给我这个错误 FileNotFoundError
FileNotFoundError: [Errno 2] 文件salary.csv 不存在：'salary.csv'
app.py
import pandas
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
@app.route('/', methods=['POST'])
def index_post():
if request.method == 'POST':
#Storing salaries.csv data into a pandas dataframe
req = request.form['fileToUpload']
df = pandas.read_csv(req)
#Just calculating some data from dataframe
base_pay_MEAN = "{:.2f}".format(df['BasePay'].mean())
base_pay_MAX = "{:.2f}".format(df['BasePay'].max())
base_pay_MIN = "{:.2f}".format(df['BasePay'].min())
overtime_MAX = df['OvertimePay'].max()
highest_paid_Person_NAME = (df[df['TotalPayBenefits'] == max(df['TotalPayBenefits'])]).iloc[0]['EmployeeName']
highest_paid_Person_SALARY = (df[df['TotalPayBenefits'] == max(df['TotalPayBenefits'])]).iloc[0]['TotalPayBenefits']
highest_paid_Person_JOB = (df[df['TotalPayBenefits'] == max(df['TotalPayBenefits'])]).iloc[0]['JobTitle']
lowest_paid_Person_NAME = (df[df['TotalPayBenefits'] == min(df['TotalPayBenefits'])]).iloc[0]['EmployeeName']
lowest_paid_Person_SALARY = (df[df['TotalPayBenefits'] == min(df['TotalPayBenefits'])]).iloc[0]['TotalPayBenefits']
lowest_paid_Person_JOB = (df[df['TotalPayBenefits'] == min(df['TotalPayBenefits'])]).iloc[0]['JobTitle']
num_Unique_Jobs = df['JobTitle'].nunique()
most_common_jobs = df.groupby('JobTitle').count().sort_values(by='Id', ascending=False)['Id'].head(3)
#Returning the data to webpage
return render_template('index.html',
base_pay_Title="Basepay",
base_pay_MEAN=( "Mean: $" + str(base_pay_MEAN)),
base_pay_MAX=( "Max: $" + str(base_pay_MAX)),
base_pay_MIN=( "Min: $" + str(base_pay_MIN)),
over_time_Title="Overtime",
over_time_MAX=("Max: $" + str(overtime_MAX)),
highest_paid_Title = "Highest Paid",
highest_paid_person=("Name: " + str(highest_paid_Person_NAME)),
highest_paid_job=("Job: " + str(highest_paid_Person_JOB)),
highest_paid_salary=("Salary: $" + str(highest_paid_Person_SALARY)),
lowest_pay_Title = "Lowest Paid",
lowest_paid_person=("Name: " + str(lowest_paid_Person_NAME)),
lowest_paid_job=("Job: " + str(lowest_paid_Person_JOB)),
lowest_paid_salary=("Salary: $" + str(lowest_paid_Person_SALARY))
)
else:
render_template('index.html')
if __name__ == '__main__':
app.run(host="localhost", port=7000, debug=True)
index.html
<html>
<head>
<link rel="stylesheet" type="text/css" href="static/main.css">
</head>
<body>
<div class="container">
<h1>
Some Title
</h1>
<p>Please upload your CSV file. The values containing addresses should be in a column named <em>address</em> or <em>Address</em></p>
<form method='POST'>
<input type="file" name="fileToUpload" id="fileToUpload">
<button id="download">Submit</button>
</form>
<div class="results">
<h3 class="base-pay">{{base_pay_Title}}</h3>
<p class="base-pay-mean">{{ base_pay_MEAN }}</p>
<p class="base-pay-high">{{base_pay_MAX}}</p>
<p class="base-pay-low">{{base_pay_MIN}}</p>
<h3 class="over-time">{{over_time_Title}}</h3>
<p class="over-time-max">{{over_time_MAX}}</p>
<h3 class="highest-paid">{{highest_paid_Title}}</h3>
<p class="highest-paid-person">{{highest_paid_person}}</p>
<p class="highest-paid-job">{{highest_paid_job}}</p>
<p class="highest-paid-salary">{{highest_paid_salary}}</p>
<h3 class="lowest-paid">{{lowest_pay_Title}}</h3>
<p class="lowest-paid-person">{{lowest_paid_person}}</p>
<p class="lowest-paid-job">{{lowest_paid_job}}</p>
<p class="lowest-paid-salary">{{lowest_paid_salary}}</p>
</div>
</div>
</body>
</html>```
【问题讨论】：