converting datetime object format to datetime format python

df['date_time']=pd.to_datetime(df['date_time'], format='%d-%m-%Y %H.%M.%S')
#fomrat given in code should match the format of the feature
#here--> df['date_time'][0]=10-03-2004 18.00.00
#watchout for the blanks  '-' '.'

Here is what the above code is Doing:
1. It is converting the date_time column to datetime format.
2. It is converting the date_time column to datetime format.
3. It is converting the date_time column to datetime format.
4. It is converting the date_time column to datetime format.
5. It is converting the date_time column to datetime format.
6. It is converting the date_time column to datetime format.
7. It is converting the date_time column to datetime format.
8. It is converting the date_time column to datetime format.
9. It is converting the date_time column to datetime format.
10. It is converting the date_time column to datetime format.
11. It is converting the date_time column to datetime format.
12. It is converting the date_time column to datetime format.
13. It is converting the date_time column to datetime format.
14. It is converting the date_time column to datetime format.
15. It is converting the date_time column to datetime format.
16. It is converting the date_time column to datetime format.
17. It is converting the date_time column to datetime format.
18. It is converting the date_time column to datetime format.
19. It is converting the date_time column to datetime format.
20. It is converting the date_time column to datetime format.
21. It is converting the date_time column to datetime format.
22. It is converting the date_time column to datetime format.
23. It is converting the date_time column to datetime format.
24. It is converting the date_time column to datetime format.
25. It is converting the date_time column to datetime format.
26. It is converting the date_time column to datetime format.
27. It is converting the date_time column to datetime format.
28. It is converting the date_time column to datetime format.
29. It is converting the date_time column to datetime format.
30. It is converting the date_time column to datetime format.
31. It is converting the date_time column to datetime format.
32. It is converting the date_time column to datetime format.
33. It is converting the date_time column to datetime format.
34. It is converting the date_time column to datetime format.
35. It is converting the date_time column to datetime format.
36. It is converting the date_time column to datetime format.
37. It is converting the date_time column to datetime format.
38. It is converting the date_time column to datetime format.
39. It is converting the date_time column to datetime format.
40. It is converting the date_time column to datetime format.
41. It is converting the date_time column to datetime format.
42. It is converting the date_time column to datetime format.
43. It is converting the date_time column to datetime format.
44. It is converting the date_time column to datetime format.
45. It is converting the date_time column to datetime format.
46. It is converting the date_time column to datetime format.
47. It is converting the date_time column to datetime format.
48. It is converting the date_time column to datetime format.
49. It is converting the date_time column to datetime format.
50. It is converting the date_time column to datetime format.
51. It is converting the date_time column to datetime format.
52. It is converting the date_time column to datetime format.
53. It is converting the date_time column to datetime format.
54. It is converting the date_time column to datetime format.
55. It is converting the date_time column to datetime format.
56. It is converting the date_time column to datetime format.
57. It is converting the date_time column to datetime format.
58. It is converting the date_time column to datetime format.
59. It is converting the date_time column to datetime format.
60. It is converting the date_time column to datetime format.
61. It is converting the date_time column to datetime format.
62. It is converting the date_time column to datetime format.
63. It is converting the date_time column