python - Get data from cell in pandas and user it in calculations -

i've got csv file loading in table using pandas.

     rank                   player  nat tot mtchwin-loss tie brkwin-loss  \ 0       1           novak djokovic  srb              5-0             0-0    1       2            roger federer  sui              1-1             0-1    2       3              andy murray  gbr              0-0             0-0    3       4             rafael nadal  esp             11-3             2-1    4       5            kei nishikori  jpn              5-0             0-0    5       6             milos raonic  can              2-1             1-0    6       7            tomas berdych  cze              4-1             2-0    7       8             david ferrer  esp             10-2             2-2    8       9            stan wawrinka  sui              1-1             0-0    9      10              marin cilic  cro              2-2             1-0    10     11          grigor dimitrov  bul              3-1             0-0    11     12          feliciano lopez  esp              5-3             4-1    12     13             gilles simon  fra              3-2             2-0    13     14       jo-wilfried tsonga  fra              2-2             0-1    14     15             gael monfils  fra              6-2             5-0    15     16    roberto bautista agut  esp              4-3             2-2    16     17           kevin anderson  rsa              2-1             1-3    17     18               john isner  usa              2-2             2-2    18     19            tommy robredo  esp              6-5             0-2    19     20           ernests gulbis  lat              0-2             0-0    20     21             david goffin  bel              1-1             0-0    21     22             ivo karlovic  cro              1-1             0-0    22     23             pablo cuevas  uru             10-4             4-2    23     24            martin klizan  svk             10-5             3-1    24     25           leonardo mayer  arg              4-4             2-1    25     26    philipp kohlschreiber  ger              3-2             3-2    26     27            bernard tomic  aus              1-1             1-1    27     28          richard gasquet  fra              0-0             0-0    28     29            fabio fognini  ita              8-5             3-2    29     30         adrian mannarino  fra              0-1             0-0    ..    ...                      ...  ...              ...             ...    170   171               elias ymer  swe              2-2             1-1    171   172              renzo olivo  arg              2-2             2-1    172   173               tommy haas  ger              0-0             0-0    173   174          nicolas almagro  esp              8-5             3-2    174   175                alex bolt  aus              0-0             0-0    175   176               mate delic  cro              0-0             0-0    176   177              liam broady  gbr              0-0             0-0    177   178            maxime authom  bel              0-0             0-0    178   179          roberto marcora  ita              0-0             0-0    179   180             marius copil  rou              0-1             0-0    180   181             lukasz kubot  pol              0-0             0-0    181   182         guilherme clezar  bra              0-3             0-1    182   183    ruben ramirez hidalgo  esp              0-0             0-0    183   184            andrej martin  svk              0-0             0-0    184   185         andrea arnaboldi  ita              0-0             0-0    185   186            gerald melzer  aut              1-1             2-1    186   187              jan hernych  cze              0-0             0-0    187   188           julian reister  ger              0-0             0-0    188   189            nicolas jarry  chi              3-1             1-0    189   190              mirza basic  bih              0-0             0-0    190   191         filippo volandri  ita              0-0             0-0    191   192           dennis novikov  usa              0-0             0-0    192   193          denys molchanov  ukr              0-0             0-0    193   194               jason jung  usa              0-0             0-0    194   195             luke saville  aus              0-0             0-0    195   196           evgeny donskoy  rus              0-1             0-1    196   197             adrian ungur  rou              0-0             0-0    197   198  hans podlipnik-castillo  chi              1-0             0-0    198   199          thomas fabbiano  ita              0-1             0-0    199   200                tim puetz  ger              0-0             0-0          tot aces  ace/ mtch avg  tot dbl flts  df/ mtch avg 1st srv 1st srv won  \ 0           9            1.8             7           1.4     62%         74%    1           9            4.5             2           1.0     59%         68%    2           0            0.0             0           0.0      0%          0%    3          25            1.8            18           1.3     68%         69%    4          14            2.8             9           1.8     57%         75%    5          16            5.3             3           1.0     64%         78%    6          18            3.6             8           1.6     53%         81%    7          18            1.5            32           2.7     62%         66%    8           2            1.0             2           1.0     58%         64%    9          20            5.0             5           1.3     60%         72%    10         12            3.0             5           1.3     63%         74%    11         66            8.3            23           2.9     60%         74%    12         14            2.8            13           2.6     64%         63%    13         13            3.3             5           1.3     59%         70%    14         32            4.0             5           0.6     63%         69%    15         16            2.3            13           1.9     64%         73%    16         40           13.3             9           3.0     65%         74%    17         49           12.3             6           1.5     68%         77%    18         41            3.7            20           1.8     66%         72%    19          9            4.5            15           7.5     52%         67%    20          9            4.5             7           3.5     51%         67%    21         23           11.5             4           2.0     71%         86%    22         78            6.5            22           1.8     56%         74%    23         49            3.1            54           3.4     59%         70%    24         41            6.8            13           2.2     64%         71%    25         10            1.7             5           0.8     65%         61%    26         11            3.7             2           0.7     70%         66%    27          0            0.0             0           0.0      0%          0%    28         41            2.9            35           2.5     57%         65%    29          0            0.0             2           2.0     64%         47%    ..        ...            ...           ...           ...     ...         ...    170        12            3.0             6           1.5     58%         65%    171         9            2.3            36           9.0     57%         71%    172         0            0.0             0           0.0      0%          0%    173        81            5.8            25           1.8     56%         75%    174         0            0.0             0           0.0      0%          0%    175         0            0.0             0           0.0      0%          0%    176         0            0.0             0           0.0      0%          0%    177         0            0.0             0           0.0      0%          0%    178         0            0.0             0           0.0      0%          0%    179         8            8.0             2           2.0     60%         78%    180         0            0.0             0           0.0      0%          0%    181        11            3.7            10           3.3     61%         64%    182         0            0.0             0           0.0      0%          0%    183         0            0.0             0           0.0      0%          0%    184         0            0.0             0           0.0      0%          0%    185        11            5.5             6           3.0     58%         75%    186         0            0.0             0           0.0      0%          0%    187         0            0.0             0           0.0      0%          0%    188        25           12.5            10           5.0     60%         72%    189         0            0.0             0           0.0      0%          0%    190         0            0.0             0           0.0      0%          0%    191         0            0.0             0           0.0      0%          0%    192         0            0.0             0           0.0      0%          0%    193         0            0.0             0           0.0      0%          0%    194         0            0.0             0           0.0      0%          0%    195         1            1.0             9           9.0     52%         70%    196         0            0.0             0           0.0      0%          0%    197         0            0.0             0           0.0      0%          0%    198         3            3.0             4           4.0     73%         61%    199         0            0.0             0           0.0      0%          0%         2nd srv won srv gam won brk pts won brk pts svd pts won ret srv1st-2nd  \ 0           58%         88%         42%         68%                39%-57%    1           54%         84%         46%         67%                37%-49%    2            0%          0%          0%          0%                  0%-0%    3           57%         82%         43%         57%                36%-58%    4           62%         92%         49%         80%                39%-62%    5           62%         90%         25%         50%                26%-46%    6           52%         82%         47%         68%                37%-49%    7           54%         78%         47%         61%                40%-56%    8           50%         59%         25%         46%                41%-47%    9           49%         74%         43%         58%                26%-43%    10          49%         85%         38%         79%                35%-48%    11          54%         82%         42%         65%                28%-50%    12          47%         68%         56%         63%                31%-56%    13          58%         87%         31%         78%                26%-45%    14          53%         82%         42%         68%                31%-51%    15          48%         80%         53%         62%                29%-53%    16          47%         83%         55%         68%                35%-47%    17          56%         91%         25%         75%                26%-39%    18          52%         82%         42%         65%                32%-48%    19          32%         50%         33%         50%                29%-39%    20          55%         76%         38%         69%                38%-52%    21          43%         88%         22%         25%                21%-45%    22          54%         82%         49%         63%                32%-47%    23          48%         76%         43%         63%                31%-49%    24          50%         81%         23%         65%                31%-57%    25          52%         67%         48%         51%                35%-54%    26          47%         73%         38%         58%                33%-52%    27           0%          0%          0%          0%                  0%-0%    28          49%         67%         49%         61%                32%-54%    29          41%         29%         33%         50%                26%-38%    ..          ...         ...         ...         ...                    ...    170         50%         69%         38%         60%                30%-55%    171         51%         79%         27%         62%                29%-51%    172          0%          0%          0%          0%                  0%-0%    173         55%         82%         32%         59%                32%-47%    174          0%          0%          0%          0%                  0%-0%    175          0%          0%          0%          0%                  0%-0%    176          0%          0%          0%          0%                  0%-0%    177          0%          0%          0%          0%                  0%-0%    178          0%          0%          0%          0%                  0%-0%    179         56%         77%         43%         40%                36%-39%    180          0%          0%          0%          0%                  0%-0%    181         44%         67%         39%         50%                24%-53%    182          0%          0%          0%          0%                  0%-0%    183          0%          0%          0%          0%                  0%-0%    184          0%          0%          0%          0%                  0%-0%    185         43%         77%         14%         73%                21%-51%    186          0%          0%          0%          0%                  0%-0%    187          0%          0%          0%          0%                  0%-0%    188         62%         86%         38%         75%                25%-43%    189          0%          0%          0%          0%                  0%-0%    190          0%          0%          0%          0%                  0%-0%    191          0%          0%          0%          0%                  0%-0%    192          0%          0%          0%          0%                  0%-0%    193          0%          0%          0%          0%                  0%-0%    194          0%          0%          0%          0%                  0%-0%    195         52%         79%         18%         70%                28%-42%    196          0%          0%          0%          0%                  0%-0%    197          0%          0%          0%          0%                  0%-0%    198         39%         60%         17%         43%                22%-45%    199          0%          0%          0%          0%                  0%-0%         ret gam won   0           46%   1           33%   2            0%   3           38%   4           42%   5           12%   6           30%   7           42%   8           33%   9           15%   10          25%   11          20%   12          31%   13          13%   14          24%   15          26%   16          26%   17           8%   18          27%   19          16%   20          32%   21           8%   22          25%   23          25%   24          21%   25          36%   26          32%   27           0%   28          31%   29          13%   ..          ...   170         23%   171         17%   172          0%   173         22%   174          0%   175          0%   176          0%   177          0%   178          0%   179         23%   180          0%   181         22%   182          0%   183          0%   184          0%   185         11%   186          0%   187          0%   188         11%   189          0%   190          0%   191          0%   192          0%   193          0%   194          0%   195         14%   196          0%   197          0%   198         11%   199          0%   

i'm not sure why goes on different lines, ideally want see go way horizontally that's not massive issue. want to able data cells based on criteria. example i've done 1st serve percentage of novak djokovic:

firstservepecentage = df[["1st srv"]][df['player'] == 'novak djokovic'] 

this returns:

  1st srv 0     62% 

as can see gets column , row names. how can value 62% can convert decimal, 0.62, , able assign variable can use calculations?

what returned series, if want value:

firstservepecentage = df[df['player'] == 'novak djokovic']['1st srv'] firstservepecentage.values[0]