两列

Question

我正在尝试使用打印功能来打印表中的每一行以打印每一行。

select_stmt = "SELECT user,password FROM account"

mycursor.execute(select_stmt)
myresult = mycursor.fetchall()

for row in myresult:
    print (row)

当前它以随意的方式打印：

(None, 'A***9****')
(None, None)
('usertest', 'pwtest')

如何填充每一列，使其看起来更清晰？谢谢

Answer 1

两列

鉴于两列的字符数绝不能超过24个，您可以使用以下示例：

for user, pwd in myresult:
    print('{: <20} {}'.format(user, pwd))

或者如果事先未知，我们可以首先确定第一列的最大大小：

len_user = max(map(lambda x: len(str(x[0])), myresult))
for user, pwd in myresult:
    print('{} {}'.format(str(user).ljust(len_user), pwd))

对于样本数据，将得出：

>>> len_user = max(map(lambda x: len(str(x[0])), myresult))
>>> for user, pwd in myresult:
...     print('{} {}'.format(str(user).ljust(len_user), pwd))
... 
None     A***9****
None     None
usertest pwtest

您可以在格式中在两个{}之间添加更多间距以增加元素之间的间距，例如：

>>> for user, pwd in myresult:
...     print('{}    {}'.format(str(user).ljust(len_user), pwd))
... 
None        A***9****
None        None
usertest    pwtest

多列

对于多列，我们可以遵循相同的过程，并使用numpy计算列的最大值：

import numpy as np

lens = np.max([[len(str(xi)) for xi in x] for x in myresult], axis=0)
myformat = ' '.join(['{}']*len(lens))

for col in myresult:
    print(myformat.format(*map(str.ljust, map(str, col), lens)))

Answer 2

在一个表中，确实有特定数量的列。最终，您不会在控制台中编写整个列。您只能在控制台中写入选定的信息。

// Protractor configuration file, see link for more information
// https://github.com/angular/protractor/blob/master/lib/config.ts

const {SpecReporter} = require('jasmine-spec-reporter');
var HtmlScreenshotReporter = require('protractor-jasmine2-screenshot-reporter');

var reporter = new HtmlScreenshotReporter({
  dest: '../build/test-results/e2e/screenshots',
  filename: 'e2e-report.html',
  reportOnlyFailedSpecs: true,
  captureOnlyFailedSpecs: true,
  showQuickLinks: true,
  reportFailedUrl: true,
  inlineImages: true
});

exports.config = {
  SELENIUM_PROMISE_MANAGER: false,
  allScriptsTimeout: 11000,
  specs: [
    './src/**/*.e2e-spec.ts'
  ],
  capabilities: {
    'browserName': 'chrome',
    chromeOptions: {
      args: ["--headless", "--disable-gpu", "--window-size=1920,1080"]
    }
  },
  directConnect: true,
  baseUrl: 'http://localhost:4201/',
  params: {},
  framework: 'jasmine',
  jasmineNodeOpts: {
    showColors: true,
    defaultTimeoutInterval: 30000,
    print: function () {
    }
  },

  beforeLaunch: function () {
    return new Promise(function (resolve) {
      process.on('uncaughtException', function () {
        reporter.jasmineDone();
        reporter.afterLaunch();
      });

      reporter.beforeLaunch(resolve);
    });
  },

  onPrepare() {
    require('ts-node').register({
      project: require('path').join(__dirname, './tsconfig.e2e.json')
    });

    jasmine.getEnv().addReporter(reporter);
    jasmine.getEnv().addReporter(new SpecReporter({spec: {displayStacktrace: true}}));

    console.log("==========> Target report configuration", browser.params.products[process.env.TARGET_REPORT_SKU]);
  },

  afterLaunch: function (exitCode) {
    return new Promise(function (resolve) {
      reporter.afterLaunch(resolve.bind(this, exitCode));
    });
  }
};

或

for user, pwd in myresult:
      print('{:>5} {:>5}'.format(user, pwd))

结帐https://docs.python.org/3.4/library/string.html#formatexamples以获得更多信息。

Answer 3

@JR ibkr @Willem Van Onsem我能够结合使用Willem的方法和JR的方法填充所有列：

select_stmt = "SELECT site, user,password, email1, email2, comment, date FROM account"
mycursor.execute(select_stmt)

myresult = mycursor.fetchall()

len_site = max(map(lambda x: len(str(x[0])), myresult))     #site
len_user = max(map(lambda x: len(str(x[0])), myresult))     #user
len_pw = max(map(lambda x: len(str(x[0])), myresult))       #pw
len_em1 = max(map(lambda x: len(str(x[0])), myresult))      #email1
len_em2 = max(map(lambda x: len(str(x[0])), myresult))      #email2
#len_com = max(map(lambda x: len(str(x[0])), myresult))     #comments (This did not pad correctly. It protruded into the dates column)
len_dt = max(map(lambda x: len(str(x[0])), myresult))       #date

for site, user, pwd, em1, em2, com, dt in myresult:

    print ('{} {} {} {} {} {:<65} {}'.format(str(site).ljust(len_site),
                        str(user).ljust(len_user), str(pwd).ljust(len_pw), str(em1).ljust(len_em1),
                        str(em2).ljust(len_em2), str(com), str(dt).ljust(len_dt)))

在正常情况下，JR，您是对的，我可能不想打印所有列，但我这样做只是为了学习。由于某些原因，注释列未正确填充，因此我手动将最大长度设置为65。不确定这是否是执行此操作的最有效方法，很想听听您的建议。谢谢

Python-如何填充mysql表的输出

3 个答案:

两列

多列