Python 如何在函数调用中有条件地向字典添加键/值对？

我试图从Jira数据库中检索数据并保存到熊猫数据框中。这是我的密码：

from jira import JIRA
import pandas as pd

cert_path = 'C:\\cert.crt'

start_date = '2020-10-01'
end_date = '2020-10-31'

# three different instances (each with their own schema)
a_session = JIRA(server='https://jira.myinstance-A.com', options={'verify': cert_path}, kerberos=True)

b_session = JIRA(server='https://jira.myinstance-B.com', options={'verify': cert_path}, kerberos=True)

c_session = JIRA(server='https://jira.myinstance-C.com', options={'verify': cert_path}, kerberos=True)


# define Jira queries
query_1 = 'project = \"Test Project 1\" and issuetype = Incident and resolution = Resolved and updated >= {} and updated <= {}'.format(start_date, end_date)

query_2 = 'project = \"Test Project 2\" and issuetype = Incident and resolution = Resolved and updated >= {} and updated <= {}'.format(start_date, end_date)

query_3 = 'project = \"Test Project 3\" and issuetype = Defect and resolution = Resolved and releasedate >= {} and releasedate <= {}'.format(start_date, end_date)

query_4 = 'project = \"Test Project 4\" and issuetype = Enhancement and resolution = Done and completed >= {} and completed <= {}'.format(start_date, end_date)


# fetch all issues from a given session for a given query
block_size = 100
block_num = 0


def get_all_issues(session, query):

    block_size = 50
    block_num = 0
    
    start = 0
    all_issues = []
    while True:
        issues = session.search_issues(query, start, block_size)
        if len(issues) == 0:
            # No more issues
            break
        start += len(issues)
        for issue in issues:
            all_issues.append(issue)

    issues = pd.DataFrame(issues)

    for issue in all_issues:
        d = {
            'jira_key' : issue.key,
            'issue_type' : issue.fields.type,
            'creator' : issue.fields.creator,
            'resolution' : issue.fields.resolution
             }

        issues = issues.append(d, ignore_index=True)

    return issues


# list of queries, and the corresponding backend
queries = [
    (a_session, query_1),
    (a_session, query_2),
    (b_session, query_3),
    (c_session, query_4),
]


# loop over each pair of session and query, calling the get_all_issues function, and save the dataframe we get each time
dataframes = []

for session, query in queries:
    dataframe = get_all_issues(session, query)
    dataframes.append(dataframe)


# concatenate all data frames
all = pd.concat(dataframes)

自定义_字段_123

存在于

a_会话

和

b_会话

中，但不存在于

c_会话

中

custom_field_456

仅存在于

c_会话中

而且，

custom\u field\u 789

存在于

b\u会话

和

c\u会话

中

使用此扩展字典运行代码会导致以下错误：

AttributeError:type对象“PropertyHolder”没有属性“custom\u field\u 123”。

我试图在所有问题中的问题之前添加一个

IF

语句：，但这种方法不起作用

---

是否有办法根据字段是否与给定的

会话相关，将键/值对添加到
d
字典中？例如，如<代码> AyStudio/QueRy2.2/代码>正在运行，只考虑<代码> CuthiFieldField123（因为这是唯一有效的）和<强> >忽略< <强> > CuthyField466和（因为通过这些会导致上面的错误消息）.
我想您需要单独添加它们。比如：

d = {
    'key' : issue.jira_key,
    'type' : issue.fields.issue_type,
    'creator' : issue.fields.creator,
    'resolution' : issue.fields.resolution
}
fields = issue.fields  # For brevity
if hasattr(fields, "custom_field_123"):
    d['system_change'] = fields.custom_field_123
if hasattr(fields, "custom_field_456"):
    d['system_resources'] = fields.custom_field_456
if hasattr(fields, "custom_field_789"):
    d['system_backup'] = fields.custom_field_789

但是，如果您使用的是Python 3.8+，并且字段值从不为空/无，则可以使用和默认值来减少重复：

if value := getattr(fields, "custom_field_123", None):
    d['system_change'] = value
if value := getattr(fields, "custom_field_456", None):
    d['system_resources'] = value
if value := getattr(fields, "custom_field_789", None):
    d['system_backup'] = value

我想你需要分别添加它们。比如：

d = {
    'key' : issue.jira_key,
    'type' : issue.fields.issue_type,
    'creator' : issue.fields.creator,
    'resolution' : issue.fields.resolution
}
fields = issue.fields  # For brevity
if hasattr(fields, "custom_field_123"):
    d['system_change'] = fields.custom_field_123
if hasattr(fields, "custom_field_456"):
    d['system_resources'] = fields.custom_field_456
if hasattr(fields, "custom_field_789"):
    d['system_backup'] = fields.custom_field_789

但是，如果您使用的是Python 3.8+，并且字段值从不为空/无，则可以使用和默认值来减少重复：

if value := getattr(fields, "custom_field_123", None):
    d['system_change'] = value
if value := getattr(fields, "custom_field_456", None):
    d['system_resources'] = value
if value := getattr(fields, "custom_field_789", None):
    d['system_backup'] = value

我希望
system\u change
键/值对在不存在/应用的情况下不存在。例如，
system\u change
在
c\u会话中不存在，因此不应被传递。我希望
system\u change
键/值对在不存在/应用的情况下不存在。例如，
system\u change
在
c\u会话中不存在，因此不应传递。