Python string format

hoge = {'a': 'aa', 'b': 'bb'}
print('a is {a}\nb is {b}'.format(**hoge))

### Left justified, center justified, right justified

```python
hoge = {'a': 'left', 'b': 'center', 'c': 'right'}
print('left  : {a:<10}'.format(**hoge))
print('center: {b:^10}'.format(**hoge))
print('right : {c:>10}'.format(**hoge))

### Left justified, center justified, right justified (0 padded)
```python
hoge = {'a': 'left', 'b': 'center', 'c': 'right'}
print('left  : {a:<010}'.format(**hoge))
print('center: {b:^010}'.format(**hoge))
print('right : {c:>010}'.format(**hoge))

### Left justified, center justified, right justified (character padding)
```python
hoge = {'a': 'left', 'b': 'center', 'c': 'right'}
print('left  : {a:_<10}'.format(**hoge))
print('center: {b:_^10}'.format(**hoge))
print('right : {c:_>10}'.format(**hoge))

### Digit separator, decimal point
```python
print('{:,}'.format(1234.5678))
print('{:,.1f}'.format(1234.5678))
print('{:,.2f}'.format(1234.5678))
print('{:,.3f}'.format(1234.5678))
print('{:,.4f}'.format(1234.5678))
print('{:,.5f}'.format(1234.5678))

## f character string

```python
a = 'aa'
b = 'bb'
print(f'a is {a}\nb is {b}')

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