# For Loops

### For Loops

```
In [1]: for number in range(1,5):
   ...:     print(number)
   ...:     
1
2
3
4


In [2]: for nt in "ACTG":
   ...:     print(nt)
   ...:     
A
C
T
G


In [3]: for number in range(1,11):
   ....:     print('Hello,World!\n')
   ....:     
Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

Hello,World!

In [5]: instructors=["Duan","Charlie","Stuart","Allen"]

In [6]: for name in instructors:
   ...:     print("Hello", name)
   ...:     
Hello Duan
Hello Charlie
Hello Stuart
Hello Allen

```

### Nested loops

```
Labeling 96 well plates
in [10]: wells=[]
In [11]: for rows in 'ABCDEF':
   ....:     for columns in range(1,13):
   ....:         wells.append('%s%02d'%(rows,columns))
   ....:         

In [12]: wells
Out[12]: 
['A01',
 'A02',
 'A03',
 'A04',
 'A05',
 'A06',
 'A07',
 'A08',
 'A09',
 'A10',
 'A11',
 'A12',
 'B01',
 'B02',
 'B03',
 'B04',
 'B05',
 'B06',
 'B07',
 'B08',
 'B09',
 'B10',
 'B11',
 'B12',
 'C01',
 'C02',
 'C03',
 'C04',
 'C05',
 'C06',
 'C07',
 'C08',
 'C09',
 'C10',
 'C11',
 'C12',
 'D01',
 'D02',
 'D03',
 'D04',
 'D05',
 'D06',
 'D07',
 'D08',
 'D09',
 'D10',
 'D11',
 'D12',
 'E01',
 'E02',
 'E03',
 'E04',
 'E05',
 'E06',
 'E07',
 'E08',
 'E09',
 'E10',
 'E11',
 'E12',
 'F01',
 'F02',
 'F03',
 'F04',
 'F05',
 'F06',
 'F07',
 'F08',
 'F09',
 'F10',
 'F11',
 'F12']
```


---

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