title: Not possible to give column names to concatenated Pandas Series
body: <p>From a pandas dataframe I calculate mean(), sd() and max() from all variables with pandas built in functions. I get back three pandas serieses.</p>
  <pre><code>import pandas as pd
  
  df_FALKO_R_scores_mean = df_FALKO_R_scores_only.mean()
  
  df_FALKO_R_scores_sd = df_FALKO_R_scores_only.std()
  
  df_FALKO_R_scores_max = df_FALKO_R_scores_only.max()
  </code></pre>
  <p>Than I concatenate the three serieses to get an output of mean, sd and max for every variable.</p>
  <p>The Problem is, as you can see below, although I add &quot;names&quot; to the concat() function, the labels of the variables are named 0, 1 and 2. This is not readable, especially if I want to plot those numbers. How can I manage to get a Pandas series with the column labels ['mean','sd','max']? I also tried &quot;ignore_index&quot; True and False.</p>
  <pre><code>df_FALKO_R_scores_mean_sd_max = pd.concat([df_FALKO_R_scores_mean, df_FALKO_R_scores_sd, df_FALKO_R_scores_max], names=['mean', 'sd', 'max'], axis=1, ignore_index=True)
  
  print(df_FALKO_R_scores_mean_sd_max)
  </code></pre>
  <p>Output:</p>
  <pre><code>                     0         1    2
  R_fd_s_01a_s  1.026490  0.631897  2.0
  R_fd_e_01b_s  0.794702  0.802645  2.0
  R_fd_e_01c_s  1.039735  1.124757  4.0
  R_fd_p_02a_s  1.390728  0.848320  3.0
  R_fd_p_02b_s  0.880795  0.552897  2.0
  R_fd_p_03_s   1.132450  1.004493  3.0
  R_fd_s_04_s   0.834437  0.769679  2.0
  R_fd_e_05_s   0.403974  0.694539  2.0
  R_fd_p_06a_s  1.105960  0.644488  2.0
  R_fd_e_06b_s  1.337748  0.979030  3.0
  R_fd_e_07_s   1.192053  1.320178  4.0
  R_fd_e_08a_s  0.748344  0.741337  2.0
  R_fd_e_08b_s  0.529801  0.737635  2.0
  R_fd_p_09a_s  1.688742  1.312430  4.0
  R_fd_p_09b_s  0.701987  0.839005  3.0
  R_fw_01_s     0.774834  0.731867  2.0
  R_fw_02_s     0.761589  0.797568  2.0
  R_fw_03_s     0.841060  0.857070  2.0
  R_fw_04_s     0.589404  0.675983  2.0
  R_fw_05_s     0.403974  0.655020  2.0
  R_fw_06_s     0.211921  0.441351  2.0
  R_fw_07_s     0.536424  0.789724  2.0
  R_fw_08_s     0.927152  0.566855  2.0
  R_fw_09a_s    1.317881  0.843571  2.0
  </code></pre>
  <p>Thanks for any help!</p>